Matthias's relations with Frederick III have in…

Matthias is captured at Chrudim while spying out the enemy camp in disguise in February 1469.

He is released because he makes his captors believe he is a local Czech groom.

The Czech Catholics, who are led by Zdeněk of Šternberk, join forces with Matthias in February 1469.

Their united troops are encircled at Vilémov by George of Poděbrady's army.

In fear of being captured, Matthias opens negotiations with his former father-in-law.

They meet in a nearby hovel, where Matthias persuades George of Poděbrady to sign an armistice promising that he will mediate a reconciliation between the moderate Hussites and the Holy See.

The next meeting between George of Poděbrady and Matthias takes place in the metropolitan see of Olomouc in April.

Here the papal legates come forward with demands including the appointment of a Catholic Archbishop to the See of Prague, which cannot be accepted by George.

The Czech Catholic Estates elect Matthias King of Bohemia in Olomouc on May 3 but he will never be crowned.

Moravia, Silesia and Lusatia soon accept his rule but Bohemia proper remains faithful to George of Poděbrady.

The Estates of Bohemia even acknowledge the right of Vladislaus Jagiello, the eldest son of Casimir IV of Poland, to succeed king George of Poděbrady.

Matthias expels George of Poděbrady's troops from Silesia.

but Matthias's army is encircled and routed at Uherský Brod on November 2, 1469, forcing him to withdraw to Hungary.

Regiomontanus goes from Esztergom to Buda and the court of Matthias Corvinus of Hungary, for whom he builds an astrolabe, and where he collates Greek manuscripts for a handsome salary.

Matthias soon orders the collection of an extraordinary tax without holding a Diet, raising widespread discontent among the Hungarian Estates.

He visits Emperor Frederick in Vienna on February 11, 1470, hoping the Emperor will contribute to the costs of the war against Poděbrady.

Although the negotiations last for a month, no compromise is worked out.

The Emperor also refuses to commit himself to promoting Matthias's election as King of the Romans.

After a month, Matthias departs Vienna without taking formal leave of Frederick III.

Matthias, having realized the Hungarian Estates' growing dissatisfaction, holds a Diet in November 1470.

The Diet again authorizes him to levy an extraordinary tax, stipulating that the sum of all taxes payable per porta cannot exceed one florin.

The Estates also make it clear that they oppose the war in Bohemia.

Moldavia and its prince, Stephen III, are the Romanian principalities' last hope of repelling the Ottoman menace.

In order to secure his southern frontier from Ottoman threats, Stephen wants to liberate Wallachia—where the hostile Radu the Handsome, the half-brother of the imprisoned Vlad Țepeș rules—from Ottoman dominion.

In 1470, he invades the country and burns down the town of Brăila.

The excommunicated George of Podébrady, to preserve his imperiled throne, enters into negotiations with Polish King Casimir IV, sacrificing his sons’ succession rights and naming the Polish king’s young son as his successor.

In the midst of the struggle with the papacy, the Catholic nobles, and Hungarian monarch Matthias Corvinus, the Catholic nobility’s choice for king of Bohemia, George dies on March 22, 1471.

On May 27, King Casimir’s fifteen-year-old son is chosen king of Bohemia as Uladislas (or Vladislav) II.

Matthias had been staying in Moravia when he was informed that a group of Hungarian prelates and barons had offered the throne to Casimir, a younger son of King Casimir IV of Poland.

The conspiracy had been initiated by Archbishop John Vitéz and his nephew Janus Pannonius, Bishop of Pécs, who oppose war against the Catholic Vladislaus Jagiellon.

Initially, their plan had been supported by the majority of the Estates, but nobody dares to rebel against Matthias, enabling him to return to Hungary without resistance.

Matthias holds a Diet and promises to refrain from levying taxes without the consent of the Estates and to convoke the Diet in each year.

His promises remedy most of the Estates' grievances and almost fifty barons and prelates confirm their loyalty to him on September 21.

The Ottomans have meanwhile seized the Hungarian forts along the river Neretva.

Matthias nominates the wealthy baron Nicholas Újlaki as King of Bosnia in 1471, entrusting the defense of the province to him.

Uzun Hassan, head of the Aq Qoyunlu Turkmens, proposed an anti-Ottoman alliance to Matthias but he refrained from attacking the Ottoman Empire.