Chapter Fourteen: Preserving the Bulwark
Emperor Frederick III had been unable to send men to assist Louis XI - his attention was taken up by the Bohemian-Hungarian War. This war had begun in 1469 when the King of Hungary, Matthias Corvinus, had invaded Bohemia to rid the country of its “heretical” Hussite king, George of Podebrady. After the death of King George in 1471, the Diet of Bohemia elected Vladislaus Jagiellon, eldest son of King Casimir IV of Poland, to succeed him, but the papal legate Lorenzo Roverella declared Matthias Corvinus the true King of Bohemia. Frederick III confirmed Vladislaus’s position as King of Bohemia and Prince-Elector, forcing Matthias to invade Austria and blockade Vienna. It was this siege that prevented Frederick from organising any real assistance for Louis XI. The siege resulted in an eventual peace between Matthias and Frederick in Korneuburg in 1477, in which Frederick promised to install Matthias as King of Bohemia and Matthias swore loyalty to the Emperor. The war finally came to an end a year after the Franco-Alliance War with the Treaty of Brno between Matthias and Vladislaus; both men were permitted to use the title King of Bohemia, and the lands of Bohemia were divided between the two.
As part of the Peace of Korneuburg, Frederick III agreed to pay Matthias I a healthy sum of 100,000 florins, to cover the costs of the Bohemian-Hungarian War. They agreed that this didn’t have to all be paid in one go - Matthias accepted the offer of being paid 20,000 florins a year for five years. Frederick raised this sum from the consolidated lands in Austria as well as Maximilian’s lands in France as Duke of Languedoc, ensuring that by 1482 the debt was fully paid off [1]. With that, Matthias was free to begin to focus on two other key parts of his reign - securing the dynasty, and defending Hungary.
Matthias’s father John I of Hungary had seen Hungary as the Bulwark of Christianity as the Ottomans continually expanded northwards into Europe. Matthias furthered that idea - it was part of why he had begun developing his professional army, the Black Army, although in recent years the Black Army had seen more use against other Christian European monarchs than it had against the Muslim Turks. So far, Matthias had proved to be a solid military commander, and his Black Army was a powerful army to suit such a commander. Matthias envisioned the next aim of the Black Army was to establish a greater Hungarian state to counteract Ottoman expansion. He saw a state stretching from the Adriatic to the Black Sea - with his rule over Croatia, an Adriatic coastline was secured, and if he could liberate Wallachia and bring both Wallachia and Moldavia into Hungarian suzerainty, then he would have the Hungarian empire that he wanted. Doing that would mean that Hungary could stretch across the entirety of southern Europe, blocking the Ottomans off at every turn - and perhaps, he could convince them to stop their conquering of Europe.
However, such a grandiose project would require an heir to follow Matthias. He was on his third wife now - Beatrice of Naples - but still only had one illegitimate child called John. By 1482, after six years of failing to get Beatrice pregnant, he began to realise that he was unlikely to have a child with Beatrice, and so began setting John up to be his heir. He publicly announced that John was to be his heir, and loaded John with riches, giving him the Duchies of Głogow and Slavonia. He also began a campaign in Rome to have Pope Sixtus IV legitimise John. Sixtus continually refused, but when Sixtus died and was replaced by Pope Innocent VIII in 1484 Matthias found a more willing ally. In a papal bull of 1485, John Corvinus was recognised as the legitimate son and heir of King Matthias I.
Matthias also began negotiations for John to marry Bianca di Montferrat, the daughter of William VIII, Marquis of Montferrat and Bianca de’ Medici. This marriage had a high symbolic value. Bianca di Montferrat was a member of the House of Palaiologos-Montferrat, the legitimate descendants of the Byzantine Emperor Andronikos II and thus the living successors to the Eastern Roman Empire. While Matthias never planned to lead a crusade powerful enough to restore the Empire, he knew that the marriage would cement Hungary’s role as the bulwark of Christianity. To begin satisfying Matthias’s dream of this great Hungarian empire, he sent envoys to Venice to negotiate the transfer of some Venetian lands on the Adriatic coastline to Hungary, and used most of Bianca di Montferrat’s dowry to buy Zadar off Venice.
Bianca di Montferrat moved to Hungary in 1486. John and Bianca were married the next year in Buda on 1st April 1487, when John was fourteen and Bianca was fifteen. Matthias then went on the charm offensive with Emperor Frederick III and Vladislaus Jagiellon, trying to convince them both to support John as Matthias’s successor when Matthias died and the Hungarian diet had to elect a new king. While they would not technically have a say in electing John, giving John international backing from the Jagiellon and Habsburg families would certainly not hurt. Frederick III gave his support to John easily, seeing the advantages of Matthias’s vision for a coast-to-coast Hungary, acting as a militarily powerful buffer zone between the Holy Roman Empire and the Ottoman Empire, but Vladislaus Jagiellon took more convincing. He promised to support John Corvinus’s bid for the Hungarian throne as long as Matthias resigned his claims on the Bohemian throne. Although Matthias wished to keep his claim on Bohemia so that he could add the kingdom to his imperial project, and use the Bohemian lands to raise money for future wars against the Turks, he agreed to Vladislaus’s terms. Given their age, John and Bianca’s marriage was not consummated for some years after their wedding in 1487, but for the time being, the Hunyadi dynasty seemed secure.
View attachment 906054
A map showing the lands involved in Matthias I’s imperial dream. Not only did he intend to conquer Wallachia and Moldavia, he also wished to take possession of Venetian lands along the coastline and push down to the Republic of Ragusa. The base map is the same as the map I put in the prologue, just zoomed in on southeast Europe.
[1] - OTL, Frederick didn’t pay the whole sum, which led to Matthias invading Austria and beginning the Austrian-Hungarian War. That no longer has to happen, giving Matthias more time to sort out his succession.