Why did the Transylvanian Peasant's Revolt happen? (1437) 

The causes, battles, negotiations, and aftermath of the Transylvanian Peasant revolt are animated on a map.
Revolts, rebellions, and revolutions were common in the feudal society of medieval Europe. But why did they happen? We often focus on the biggest peasant revolts, like the English Peasant's Revolt, the French Jacqueline Revolt, or the German Peasant's War, but less - far less - talked about is the Transylvanian peasant revolt of 1437.