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In page Geneva:

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Geneva was a haven for Calvinists, while Roman Catholics and others considered heretics were persecuted. The case of Michael Servetus, an early Nontrinitarian, is notable. Condemned by both Catholics and Protestants alike, he was arrested in Geneva and burnt at the stake as a heretic by order of the city's Protestant governing council. John Calvin and his followers denounced him, and possibly contributed to his sentence.[citation needed]