Jan Žižka z Trocnova a Kalicha (English: John Zizka of Trocnov and the Chalice; c. 1360 – 11 October 1424) was a Czech military leader and knight who was a contemporary and follower of Jan Hus, and a prominent Radical Hussite who led the Taborite faction during the Hussite Wars. Renowned for his exceptional military skill, Žižka is celebrated as a Czech national hero. Žižka led the Hussite forces in battles against three crusades and remained undefeated throughout his military career.
Žižka was born in the village of Trocnov, located in the Kingdom of Bohemia, into a family of lower Czech nobility. According to Piccolomini's Historia Bohemica, he maintained connections within the royal court during his youth and later held the office of Chamberlain to Queen Sofia of Bavaria. He fought in the Battle of Grunwald (15 July 1410), where he defended Radzyń against the Teutonic Order. Later, he played a prominent role in the civil wars in Bohemia. He led the Hussites during the first important clashes of the conflict in the Battle of Sudoměř (1420) and in the Battle of Vítkov Hill (1420). In the Battle of Kutná Hora (1421) he defeated the army of the Holy Roman Empire and the Hungarian Kingdom. The effectiveness of his field artillery against the royal cavalry in this battle made it a successful element of Hussite armies.