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(c. 1369–1415) was a Czech priest, master at Charles University in Prague, and a key pre-Reformation reformer who condemned the corruption of the Catholic Church and advocated for the use of the Czech language in worship. Influenced by the writings of John Wycliffe, Hus preached against the sale of indulgences, simony, and the moral failings of the clergy, which eventually led to his excommunication and execution.

Early Life and Career Born in the village of Husinec to peasant parents, Hus studied at the University of Prague, earning his Bachelor of Arts in 1393 and Master of Arts in 1396.
He was ordained a priest in 1400 and became a prominent preacher at the Bethlehem Chapel in 1402, where he delivered sermons in the common Czech language rather than Latin. His rise was marked by his appointment as rector of the university in 1402–03, though he never obtained a doctorate in divinity.

Conflict and Excommunication Hus's reformist views, particularly his support for Wycliffite ideas and his criticism of the papal schism, put him at odds with Archbishop Zbyněk of Prague and the Roman Curia. Following the Kuttenberg Decree of 1409, which gave Czech masters control of the university, Hus was excommunicated in 1411 after refusing to accept the authority of Pope John XXIII regarding the sale of indulgences.
He appealed directly to Jesus Christ as the supreme judge in 1412, bypassing church hierarchy, a move that further solidified his status as a pariah among church officials.

Trial and Martyrdom In 1414, Hus traveled to the Council of Constance under a safe conduct promise from Holy Roman Emperor Sigismund but was imprisoned shortly after arrival.
Despite the promise of safety, he was tried for heresy, accused of holding thirty teachings attributed to Wycliffe, and refused to recant even when faced with the prospect of death. On July 6, 1415, the council condemned him as a heretic, stripped him of his ecclesiastical vestments, and handed him over to secular authorities, who burned him at the stake outside the city walls.

Legacy Hus's execution sparked the Hussite Wars and established him as a vital precursor to the Protestant Reformation, directly influencing later figures like Martin Luther.
His death is remembered as a pivotal moment in the history of Czech nationalism and religious reform, symbolizing resistance against ecclesiastical corruption and the pursuit of biblical truth.