Novák Ádám (szerk.): Fontes Memoriae Hungariae III. Varsóban őrzött magyar vonatkozású oklevelek, 1439–1489. Közreadja: Novák Ádám, Tóth Orsolya és Tóth Péter (Debrecen, 2019)
Sobiesław Szybkowski: Polish-Hungarian Relations between 1437 and 1490. A Short Introduction
XXI Casimir (who later became a saint). In autumn 1471, between ten and twenty thousand Polish cavalrymen set out to Hungary to enthrone the young Jagiellon. However, these actions were not approved of in Poland and even the members of the Polish royal council who were sent to Hungary with the young Prince gave voice to their reluctance of waging war. In the meantime, Matthias managed to calm down the domestic situation. He successfully won over some of his opponents, while some were defeated. The Polish army did eventually reach Buda, but soon retreated to Nitra. The last battles were fought at the turn of 1472 after which the Polish army retreated. At that time, they only occupied a few castles in Upper Hungary, but soon they lost these as well. Despite the announcement made at the end of January 1472, the next Hungarian campaign never took place.69 Instead, the opposing parties started negotiating in Buda which led to the armistice signed on 31 March 1472 (it was in force from 31 May 1472 to 31 May 1473) and it concerned military operations in both Hungary and Bohemia. Eventually, Casimir Jagiellon only agreed to stop fighting until 24 June 1472. However, no major battles were fought later either. This was due to the fact that the Pope imposed his mediation and sent a legate, Marco Barbo, to reconcile the feuding monarchs. The conflict was now taking place at a diplomatic level. Matthias was trying to win over both the Habsburgs and the Hohenzollerns from Brandenburg, whereas Casimir Jagiellon formed an alliance with the Bavarian Wittelsbachs. 70 The papal legate was also busy as he managed to prolong the treaty of Buda until 1 May 1473. Under his pressure, the opposing parties met at a congress in Nysa which lasted from March to April 1473. It resulted in another peace treaty (in force until 15 August) and the adversaries agreed to organize another congress, this time in Troppau, on the day on which the armistice was going to expire. If a peace treaty had not been signed during this congress, the conflict was supposed to be settled by an arbiter, either Charles the Brave, Duke of Burgundy, or Albert Achilles Hohenzollern, Elector of Brandenburg. Matthias 69 Długosz, Lib. XII/2. 275–277., 279.; Prochaska, Antoni: Wyprawa św. Kazimierza na Węgrzy (1471–1474). Ateneum Wileńskie 1. (1923). 1–27., 117–139.; Kiryk, 1967. 134.; Górski, 1982. 488.; Łowmiański, 1999. 284–285.; Kalous, 2009. 146., 159–161.; Engel, 2001. 304–305.; Baczkowski, 2014. 59–66. 70 Górski, 1982. 488–489.; Biskup, Marian: Wokół „landsuckiego wesela” 1475 roku. In: Kazi mierz Jagiellończyk. 285–300. 286–291.; Baczkowski, 2014. 67–75., 77–80.; Bárány, Attila: King Matthias and the Western European Powers. In: Mathias Rex 1458–149 0 – Hungary at the Dawn of the Renaissance. Ed. Draskóczy, István, Horváth, Iván, Kiss Farkas, Gábor, Marosi, Ernő, Voigt, Vilmos. Budapest, 2013. (on-line : http://renaissance.elte.hu/wp-content/uploads/2013/09/At tila-Barany-King-Matthias-and-the-Western-European-Powers.pdf. Download 2019. nov. 21.) 1–2.; Idem: Matthias Corvinus and Charles the Bold. Chronica 12. (2012–2016). 70–71.
