Ethiopia's Christians will be confronted from the mid-fifteenth through the mid-seventeenth century by the aggressiveness of the Muslim states, the far-reaching migrations of the Oromo, and the efforts of the Portuguese—who have been summoned to aid in the fight against the forces of Islam—to convert them from Monophysite Christianity to Roman Catholicism.

The effects of the Muslim and Oromo activities and of the civil strife engendered by the Portuguese will leave the empire much weakened by the mid-seventeenth century.

One result is the emergence of regional lords essentially independent of the throne, although in principle subject to it.

Beginning in the thirteenth century, one of the chief problems confronting the Christian kingdom, ruled at this time by the Amhara, is the threat of Muslim encirclement.

By this time, a variety of peoples east and south of the highlands have embraced Islam, and some have established powerful sultanates (or shaykhdoms).

One of these is the sultanate of Ifat in the northeastern Shewan foothills, and another is centered in the Islamic city of Harar farther east.

In the lowlands along the Red Sea are two other important Muslim peoples—the Afar and the Somali.

As mentioned previously, Ifat posed a major threat to the Christian kingdom, but it is finally defeated by Amda Siyon in the mid-fourteenth century after a protracted struggle.

During this conflict, Ifat is supported by other sultanates and by Muslim pastoralists, but for the most part, the Islamicized peoples inhabit small, independent states and are divided by differences in language and culture.

Many of them speak Cushitic languages, unlike the Semitic speakers of Harar.

Some are sedentary cultivators and traders, while others are pastoralists.

As a consequence, unity beyond a single campaign or even the coordination of military activities is difficult to sustain.

Their tendency toward disunity notwithstanding, the Muslim forces continue to pose intermittent threats to the Christian kingdom.

By the late fourteenth century, descendants of the ruling family of Ifat have moved east to the area around Harar and have reinvigorated the old Muslim sultanate of Adal, which becomes the most powerful Muslim entity in the Horn of Africa.

Egyptian Muslims destroy Ethiopia's neighboring Nile River valley's Christian states in the fourteenth and fifteenth centuries.

Tenuous relations with Christians in western Europe and the East Roman Empire continue via the Coptic Church in Egypt.

The Coptic patriarchs in Alexandria are responsible for the assignment of Ethiopian patriarchs—a church policy that Egypt's Muslim rulers occasionally try to use to their advantage.

For centuries after the Muslim conquests of the early medieval period, this link with the Eastern churches constitutes practically all of Ethiopia's administrative connection with the larger Christian world.

A more direct if less formal contact with the outside Christian world is maintained through the Ethiopian Monophysite community in Jerusalem and the visits of Ethiopian pilgrims to the Holy Land.

Ethiopian monks from the Jerusalem community attends the Council of Florence in 1441 at the invitation of the pope, who is seeking to reunite the Eastern and Western churches.

Westerners have learned about Ethiopia through the monks and pilgrims and become attracted to it for two main reasons.

First, many believe Ethiopia is the long-sought land of the legendary Christian priest-king of the East, Prester John.

Second, the West views Ethiopia as a potentially valuable ally in its struggle against Islamic forces that will continue to threaten southern Europe until the Turkish defeat at the Battle of Lepanto in 1571.

Portugal, the first European power to circumnavigate Africa and enter the Indian Ocean, displays initial interest in this potential ally by sending a representative to Ethiopia in 1493.

The Ethiopians, in turn, send an envoy to Portugal in 1509 to request a coordinated attack on the Muslims.

Europe receives its first written accounts of the country from Father Francisco Álvares, a Franciscan who accompanies a Portuguese diplomatic expedition to Ethiopia in the 1520s.

His book, A True Relation of the Lands of Prester John of the Indies, stirs further European interest and proves a valuable source for future historians.

Adal comes to control the important trading routes from the highlands to the port of Zeila, thus posing a threat to Ethiopia's commerce and, at times, to Christian control of the highlands.

Although the Christian state is unable to impose its rule over the Muslim states to the east, it is strong enough to resist Muslim incursions through the fourteenth century and most of the fifteenth.

As the long reign of Zara Yakob comes to an end, however, the kingdom again experiences succession problems.

It is the monarchs' practice to marry several wives, and each seeks to forward the cause of her sons in the struggle for the throne.

In those cases where the sons of the deceased king are too young to take office, there can also be conflict within the council of advisers at court.

In a polity that has been held together primarily by a strong warrior king, one or more generations of dynastic conflict can lead to serious internal and external problems.

Only the persistence of internal conflicts among Muslims generally and within the sultanate of Adal in particular prevents a Muslim onslaught.

Relations between Christian and Muslim powers take the form of raids and counterraids through the first quarter of the sixteenth century in Ethiopia.

Each side seeks to claim as many slaves and as much booty as possible, but neither side attempts to bring the other firmly under its rule.

By the second decade of the sixteenth century, however, a young soldier in the Adali army, Ahmad ibn Ibrahim al Ghazi, has begun to acquire a strong following by virtue of his military successes and in time becomes the de facto leader of Adal.

Concurrently, he acquires the status of a religious leader.

Ahmad, who comes to be called Gragn (the "Lefthanded") by his Christian enemies, rallies the ethnically diverse Muslims, including many Afar and Somali, in a jihad intended to break Christian power.

In 1525 Gragn leads his first expedition against a Christian army and over the next two or three years continues to attack Ethiopian territory, burning churches, taking prisoners, and collecting booty.

At the Battle of Shimbra Kure in 1529, according to historian Taddesse Tamrat, "Imam Ahmad broke the backbone of Christian resistance against his offensives."

The emperor, Lebna Dengel (Dawit II, reigned 1508-40), is unable to organize an effective defense, and in the early 1530s Gran's armies penetrate the heartland of the Ethiopian state—northern Shewa, Amhara, and Tigray—devastating the countryside and thereafter putting much of what had been the Christian kingdom under the rule of Muslim governors.

Interior East Africa (1540–1683 CE): Gunpowder Frontiers, Oromo Migrations, and Great Lakes Statecraft

Geographic & Environmental Context

The subregion of Interior East Africa includes Eritrea, Djibouti, Ethiopia, South Sudan, Uganda, Rwanda, Burundi, Zambia, northern Zimbabwe, northern Malawi, northwestern Mozambique, inland Tanzania, and inland Kenya. Anchors include the Ethiopian and Eritrean highlands, the Rift Valley lakes and corridors (Tana, Turkana, Victoria, Kivu, Tanganyika, Mweru), the interlacustrine plateaus (Rwanda–Burundi–Uganda), the savanna woodlands of inland Tanzania and Zambia, and the Lake Chad–Nile fringe toward South Sudan. Highlands, plateaus, and rift basins remained the interior’s great funnels, carrying people, herds, ideas, and goods between the Nile and the Indian Ocean.

Climate & Environmental Shifts

The later Little Ice Age intensified interannual variability. Highland Ethiopia experienced frost episodes and drought pulses that stressed terrace fields and church granaries. Equatorial plateaus saw uneven long and short rains, with years of bumper banana and millet harvests followed by shortfalls. Major rift lakes fluctuated, shifting fisheries and floodplain soils; farther south, miombo belts alternated between fire-opened woodland and denser canopies as rainfall wavered.

Subsistence & Settlement

• Highlands (Ethiopia/Eritrea): Mixed plow agriculture—teff, barley, wheat, pulses—on terraced slopes; ox traction; beekeeping; coffee gardens in humid pockets. Sheep, goats, and cattle grazed uplands; church forests protected springs and pollinators.

• Interlacustrine plateau (Uganda–Rwanda–Burundi): Intensive banana/plantain (matoke) complexes with beans, yams, and finger millet; cattle and small stock structured rank, tribute, and marriage payments.

• Savannas and rift margins (inland Tanzania–Zambia–n. Malawi/n. Mozambique): Sorghum, pearl millet, later maize (gaining ground mid-period); groundnuts and cucurbits; riverine and lacustrine fisheries on Victoria, Tanganyika, Mweru.

• Pastoral–agro-pastoral belts (Turkana, Karamoja, South Sudan): Seasonal transhumance of cattle, sheep, goats; grain via exchange with cultivators; dry-season wells and pasture reserves managed by lineage councils.

Technology & Material Culture

Highland terraces, stone bunds, and hillside canals stabilized soils; wooden scratch plows with iron shares anchored grain regimes. Ironworking furnished hoes, knives, and prestige blades; salt bars from Danakil and rift natron moved as media of exchange. Courtly ateliers in the Great Lakes produced drums, inlaid stools, and regalia; barkcloth and banana-fiber cordage provisioned dense settlements. In churches and monasteries, parchment manuscripts, bindings, and processional crosses embodied elite devotion. Matchlocks and powder arrived to the northern highlands via the Red Sea; inland, smiths refitted imported barrels and forged spearheads and mail.

Movement & Interaction Corridors

Ridge-top roads and river fords tied Solomonic capitals to granary provinces and Massawa; caravan paths crossed Afar to salt pans. Southward, drum-roads and canoe chains linked Bunyoro, Buganda, Rwanda, Burundi, and Karagwe to fisheries, iron districts, and interior–coast exchanges (cloth, beads, copper, later slaves and ivory) that fed Swahili entrepôts indirectly from inland markets. To the west and south, copper and salt moved between plateau polities and the central African savannas; to the Nile, cattle, captives, and gum filtered through the Sudd margins.

Cultural & Symbolic Expressions

• Highlands: The Solomonic monarchy maintained Christian sacral kingship; saints’ feasts, fasting calendars, and monastic networks bound rural parishes to the throne. Hymns, hagiographies, and chronicles legitimated rule and recorded calamities and victories.

• Great Lakes kingdoms: Royal drums and regnal names staged sovereignty; origin epics and shrine cults ordered land, cattle, and rain. Clientship idioms (ubugabire, ubuhake) tied patrons and clients; clan shrines mediated justice.

• Pastoral belts: Age sets, cattle rituals, oath-taking over spears and gourds, and ngoma song cycles governed drought, pasture, and war.

Environmental Adaptation & Resilience

Highlanders intercropped cereals and pulses, rotated terraces, and relied on church granaries; when fields failed, bee-keeping and forest coffee buffered diets. Plateau households stabilized soils through perennial banana groves, mulch, and shade; smoked fish bridged hungry seasons. Pastoralists staggered herds by age/sex across grazing zones, kept drought boreholes in reserve, and traded milk/meat for grain. Salt, iron, and cloth circulated as crisis goods; shrine networks coordinated labor for canal repair and terrace rebuilding after deluges.

Technology & Power Shifts (Conflict Dynamics)

Northern politics pivoted on gunpowder frontiers and migration:

• The Adal–highland wars crested when Ahmad ibn Ibrahim “Gragn” drove matchlock-armed campaigns deep into the Christian kingdom (1529–1543). With Portuguese musketeers and cannon, highland forces reversed Adal’s advances; by the 1540s the immediate threat subsided.

• The Oromo expansions (mid-16th–17th centuries) surged into the highlands via gadaa-organized age-sets, transforming demography, landholding, and tribute in Shewa, Bale, and beyond; armed horsemen and lancers reshaped frontier ecologies and politics.

• Jesuit missions followed victory—Susenyos briefly embraced Catholicism (1620s), provoking revolt; Fasilidesexpelled Jesuits (1632) and inaugurated the Gondar era (from c. 1636), rebuilding churches and courts while keeping firearms at arm’s length.

Across the interlacustrine, statecraft thickened: Bunyoro defended iron and fish corridors; Buganda expanded eastward along Lake Victoria’s shores; Rwanda’s Nyiginya court centralized hills through cattle-clientship; Burundiconsolidated regnal drums and hill polities. Earthwork forts, stockades, and long-drum signals coordinated musters; raiding and captives entered inland–coast circuits more visibly late in the period.

Transition

By 1683 CE, Interior East Africa had been remapped by war, migration, and statecraft. The highland throne survived the gunpowder shock, turned inward to Gondar, and faced a transformed Oromo frontier; the Great Lakes courts consolidated along lakes, gardens, and drum-roads; pastoral corridors adapted to climate flicker with deeper transhumance calendars. Inland caravan and canoe markets bound producers to distant Indian Ocean demand without ceding autonomy. The next age would tighten those links: ivory, captives, and cloth flows, new firearms, and missionary diplomacy—extending interior polities’ reach even as external pressures grew.

The emperor Gelawdewos (reigned 1540-59), joining with a small number of Portuguese soldiers requested earlier by Lebna Dengel, is finally able to defeat the Muslim forces and kill Grahn.

The death of the charismatic Grahn destroys the unity of the Muslim forces that had been created by their leader's successes, skill, and reputation as a warrior and religious figure.

Ethiopia's Christian armies slowly push the Muslims back and regain control of the highlands.

Ethiopians have suffered extraordinary material and moral losses during the struggle against Grahn, and it will be decades or even centuries before they will recover fully.

The memory of the bitter war against Grahn remains vivid even today.

The first Portuguese forces respond to a request for aid in 1541, although by this time the Portuguese are concerned primarily with strengthening their hegemony over the Indian Ocean trade routes and with converting the Ethiopians to Roman Catholicism.

Nevertheless, joining the forces of the Christian kingdom, the Portuguese succeed eventually in helping to defeat and kill Gragn.

Portuguese Roman Catholic missionaries arrived in 1554.

Efforts to induce the Ethiopians to reject their Monophysite beliefs and accept Rome's supremacy continue for nearly a century and engender bitterness as pro- and anti-Catholic parties maneuver for control of the state.

At least two emperors in this period allegedly convert to Roman Catholicism.

The second of these, Susenyos (reigned 1607-32), after a particularly fierce battle between adherents of the two faiths, abdicates in 1632 in favor of his son, Fasilides (reigned 1632-67), to spare the country further bloodshed.

The expulsion of the Jesuits and all Roman Catholic missionaries follows.

This religious controversy leaves a legacy of deep hostility toward foreign Christians and Europeans that will continue into the twentieth century.

It also contributes to the isolation that follow for the next two hundred years.

The Oromo migration results, in a more immediate sense, in a weakening of both Christian and Muslim power and drives a wedge between the two faiths along the eastern edge of the highlands.

In the Christian kingdom, Oromo groups infiltrate large areas in the east and south, with large numbers settling in Shewa and adjacent parts of the central highlands.

Others penetrate as far north as eastern Tigray.

The effect of the Oromo migrations is to leave the Ethiopian state fragmented and much reduced in size, with an alien population in its midst.

Hereafter, the Oromo play a major role in the internal dynamics of Ethiopia, both assimilating and being assimilated as they are slowly incorporated into the Christian kingdom.

In the south, the Sidama fiercely resist the Oromo, but, as in the central and northern highlands, they are compelled to yield at least some territory.

In the east, the Oromo sweep up to and even beyond Harar, dealing a devastating blow to what remains of Adal and contributing in a major way to its decline.

The Christian kingdom of Ethiopia, its political and military organization already weakened by the Muslim assault, begins in the mid-sixteenth century to be pressured on the south and southeast by movements of the Oromo (called Galla by the Amhara).

These migrations also affect the Sidama, Muslim pastoralists in the lowlands, and Adal.

At this time, the Oromo, settled in far southern Ethiopia, are an egalitarian pastoral people divided into a number of competing segments or groups.

They share, however, a type of age-set system of social organization called the gada system, which is ideally suited for warfare.

Their predilection toward warfare, apparently combined with an expanding population of both people and cattle, leads to a long-term predatory expansion at the expense of their neighbors after about 1550.

Unlike the highland Christians or on occasion the lowland Muslims, the Oromo are not concerned with establishing an empire or imposing a religious system.

In a series of massive but uncoordinated movements during the second half of the sixteenth century, they penetrate much of the southern and northern highlands as well as the lowlands to the east, affecting Christians and Muslims equally.

These migrations also profoundly affect the Oromo.

Disunited in the extreme, they attack and raid each other as readily as neighboring peoples in their quest for new land and pastures.

As they move farther from their homeland and encounter new physical and human environments, entire segments of the Oromo population adapt by changing their mode of economic life, their political and social organization, and their religious adherence.

Many mix with the Amhara (particularly in Shewa), become Christians, and eventually obtain a share in governing the kingdom.

In some cases, royal family members come from the union of Amhara and Oromo elements.

In other cases, Oromo, without losing their identity, become part of the nobility, but no matter how much they change, Oromo groups generally retain their language and sense of local identity.

So differentiated and dispersed will they become, however, that few foreign observers will recognize the Oromo as a distinct people until the twentieth century.

Nur ibn Mujahid ibn ‘Ali ibn ‘Abdullah al Dhuhi Suha (literally "the morning star"), a member of the Ahl Suhawyan clan of the Somali tribe of Marehan, Darod group, had married the firebrand widow of Ahmad Gragn, also succeeding him as leader of the Muslim forces fighting Christian Ethiopia.

Nur ibn Mujahid, while campaigning against the Cushitic-speaking Agaw in Gojjam in 1548, once again invades Ethiopia.

Gelawdewos's vassal Fanu'el succeeds in repulsing the Muslims, but the Emperor follows up with a further attack into Muslim territory, plundering the countryside for six months.

(Mohammed Hassan has plausibly argued that because the participants in this conflict weakened each other severely, this provided an opportunity for the Oromo people to migrate into the lands south of the Abay east to Harar and make them their homelands.)