A person who opposes papal authority or the papal system of church governance.
From antipapacy + -ist (follower or practitioner). Emerged as a specific ideological label during the Reformation and Counter-Reformation periods.
Some famous antipapalists were themselves clergy who believed the Pope had become corrupt or overstepped his authority—they weren't necessarily anti-Catholic, just anti-papal-absolutism, a distinction that got lost in the chaos of Reformation wars.
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