Amda Seyon I (also Amde Tsiyon and other variants, "Pillar of Zion") is Emperor of Ethiopia (1314–1344 throne name Gebre Mesqel Ge'ez, "slave of the cross"), and a member of the Solomonic dynasty.
According to the British expert on Ethiopia, Edward Ullendorff, "Amde Tseyon was one of the most outstanding Ethiopian kings of any age and a singular figure dominating the Horn of Africa in the fourteenth century."
His conquests of Muslim borderlands greatly expand Ethiopian territory and power in the region, maintained for centuries after his death.
Amda Seyon asserts the strength of the newly (1270) installed Solomonic dynasty and therefore legitimizes it.
These expansions further provide for the spread of Christianity to frontier areas, sparking a long era of proselytization, Christianization, and integration of previously peripheral areas.