What is an ecclesiatical heretics?

Ecclesiastical heretics are individuals or groups within a religious community, particularly in Christianity, who hold beliefs or practices that deviate from established doctrines or teachings of the church. These beliefs are often seen as contrary to the core tenets of faith, leading to their condemnation by church authorities. Historically, heresy has been a significant concern for religious institutions, often resulting in excommunication or other forms of disciplinary action. The term reflects the tension between maintaining doctrinal purity and allowing for diverse interpretations within a faith.