Žižka was the military leader of the Hussites in the Hussite Wars. The Hussites were a proto-Protestant, Christian movement following the teachings of Czech priest, philosopher, reformer, and master at Charles University in Prague, Jan Hus (c. 1369–1415). On November 13, 1419 a temporary armistice was concluded between the partisans of King Sigismund, the last Emperor of the House of Luxemburg and the citizens of Prague. Žižka disapproved of this compromise and left Prague for Plzeň, one of the richest cities of the kingdom with his followers, but soon left that city. On March 25, 1420 he defeated the partisans of Sigismund at Sudoměř, the first pitched battle of the Hussite wars. He later arrived at Tábor, the then-recently established stronghold of the Hussite movement. The ecclesiastical organization of Tabor had a somewhat puritanical character with a very strict military discipline being instituted though the government was established on a thoroughly democratic basis. Žižka took a large part in the organization of the new military community and became one of the four captains of the people ("hejtman") who were at its head.