The siege of Vienna was a decisive siege in 1485 of the Austrian–Hungarian War. It was a consequence of the ongoing conflict between Frederick III and Matthias Corvinus. After the fall of Vienna it was merged with Hungary from 1485 to 1490. Matthias Corvinus also moved his royal court to the newly occupied city. However Vienna did not become the capital of Hungary. Background In 1483 and 1484, Vienna was already being cut off from the Holy Roman Empire because its concentric defensive strongholds, including Korneuburg, Bruck, Hainburg, and later Kaiserebersdorf, had all fallen. One of the most important engagements was the Battle of Leitzersdorf, which made the following year's siege possible. The city was ravaged by famine, but the emperor, Frederick III, managed to send in some vital supplies with a breakthrough to the city by 16 vessels on the Danube. On 15 January, Matthias called on the city to surrender, but Captain von Wulfestorff refused to do so, in the hope that an imperial relief force would arrive in time. The blockade was fully in place as soon as Matthias attacked Kaiserebersdorf, where he became the target of an assassination attempt, when a cannonball nearly killed him. Matthias suspected treachery, as the accuracy of the shot had been too precise to have come from a long-distance cannon. Only someone who knew the whereabouts of the king would have been able to come so near to killing him. He accused Jaroslav von Boskowitz und Černahora, the brother of his mercenary Captain Tobias von Boskowitz and Černahora, of having been bribed to turn against the king. Jaroslav was summarily beheaded without any chance to clear his name. The events angered his brother Tobias to the point that he ended up returning to the service of Frederick and was placed in charge of his campaigns to try to reconquer his lost lands after the death of Matthias in 1490. After Kaiserebersdorf was captured in mid-1485, the fate of Vienna was sealed. Siege Matthias stationed his armies at the Hundsmühle flour mills and in Gumpendorf on the south side of the Vienna River. The King had previously brought in seventeen siege guns to Austria and with it he ordered a constant barrage of the city. At the same time, he also ordered the construction of two siege towers (one of which was later burnt by the resisting Viennese militia). Matthias made his