Conciliarism is a reform movement within the Catholic Church that emerged in the late Middle Ages, advocating for the authority of church councils over the pope. This idea was fueled by ongoing disputes over papal authority and the need for reform, leading to a belief that church councils could effectively address issues of governance, doctrine, and corruption within the Church hierarchy. The movement gained particular significance during times of crisis, such as during the Avignon Papacy and the Great Schism, highlighting the tension between papal supremacy and collective church authority.
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