Editing 1437 (section)

=== July&ndash;September ===
* [[July 6]]&ndash; The [[Transylvanian peasant revolt]] comes to an end with a formal treaty signed at the monastery of Cluj-Manastur, reducing the [[tithe]] to be paid to their employers, and abolishing the tax requiring surrendering one-ninth of each individual's production of wine and grain, and confirming the right of peasants to move freely within Transylvania.<ref>Pal Engel, ''The Realm of St Stephen: A History of Medieval Hungary, 895-1526'' (I. B. Tauris, 2001) {{ISBN|9780857731739}}</ref>
* [[August 22]]&ndash; Portugal's disastrous Tangier expedition to attack Morocco begins as [[Prince Henry the Navigator]] and more than 6,000 troops (3,000 knights, 2,000 infantry, 1,000 archers) sail from the port of [[Belém, Lisbon|Belém]] toward Africa and the Portuguese colony of [[Ceuta]]. They arrive at Ceuta five days later.<ref name=Quintella>Ignacio da Costa Quintella, ''Annaes da Marinha Portugueza'', 2 vols (Lisbon: Academia Real das Sciencias, 1840) pp.87-95</ref>
* [[September 20]]&ndash;
**Led by [[Prince Henry the Navigator]], a poorly-prepared Portuguese [[Battle of Tangier (1437)|attempt to conquer]] the city of [[Tangier]] in the [[Marinid dynasty|Marinid Sultanate]] in [[Morocco]] begins. Although the Portuguese have more than 6,000 troops, they reach the walled city and find that their scaling ladders are too short to reach the top, and their artillery is too weak to damage the walls.<ref name=Quintella/>
**The siege of the [[Sion Castle]] in [[Bohemia]] by the armies of the [[Sigismund of Luxembourg|Emperor Zikmund Lucemburský]] is successful.
* [[September 30]]&ndash; A Moroccan relief force of at least 10,000 cavalry and 90,000 foot soldiers arrives at Tangier to halt Portugal's assault on Tangier.<ref name=Quintella/>