They formed, and identified with various religious groups advocating greater purity of worship and doctrine, as well as personal and group piety. Puritans adopted a Reformed theology, but they also took note of radical criticisms of Zwingli in Zurich and Calvin in Geneva. In church polity, some advocated for separation from all other Christians, in favor of autonomous gathered churches. These separatist and independent strands of Puritanism became prominent in the 1640s, when the supporters of a Presbyterian polity in the Westminster Assembly were unable to forge a new English national church.
Where was Calvin criticized?
Geneva