"It is true that Calvin and his fellow pastors in Geneva were involved in the death of Servetus.However, it would be difficult to find any church leader in the 16th century who advocated a more gentle approach. Luther called for attacks on German peasants and wrote an angry tract against the Jews, called ‘On the Jews and their Lies'. Zwingli, the Reformer of Zurich, supported the execution by drowning of the Anabaptist leader, Felix Manz. Sir Thomas More, England's Catholic Lord Chancellor, presided over the execution of those he viewed as “heretics” in England during the reign of Henry the VIII. Each country of Europe in the sixteenth century felt that defending its religious views involved taking strong measures against those who disagreed. Toleration and acceptance of doctrinal differences were simply not sixteenth century concepts."
January 1, 1970
https://en.wikiquote.org/wiki/John_Calvin