Task: Question Generation
Input (English): During the tumultuous 14th century, disputes within the leadership of the Church led to the Avignon Papacy of 1305–78, also called the "Babylonian Captivity of the Papacy" (a reference to the Babylonian captivity of the Jews), and then to the Great Schism, lasting from 1378 to 1418, when there were two and later three rival popes, each supported by several states. Ecclesiastical officials convened at the Council of Constance in 1414, and in the following year the council deposed one of the rival popes, leaving only two claimants. Further depositions followed, and in November 1417 the council elected Martin V (pope 1417–31) as pope.
Output (English): How many popes existed simultaneously after the Council of Constance?