The Council of Basel is formally convened on July 23,1431 by papal legate Cardinal Cesarini, acting on behalf of Pope Martin V, who had called the council shortly before his death in February 1431.
The Council met to address reforms within the Catholic Church, in Basel, Switzerland, to address the Hussite heresy, establish peace in Europe, and pursue reunion with the Eastern Church. The council immediately struggled with the new Pope Eugenius IV, who attempted to dissolve or move it, leading to a long-running dispute. The council lasted until 1449, during which it declared Pope Eugenius IV deposed and elected an anti-pope, Felix V, in 1439.