 During the English Civil War, the Calvinistic Puritans produced the Westminster Confession, which became the confessional standard for Presbyterians in the English-speaking world.As the Ottoman Empire did not force Muslim conversion on its conquered western territories, reformed ideas were quickly adopted in the two-thirds of Hungary they occupied (the Habsburg-ruled third part of Hungary remained Catholic).A Reformed Constitutional Synod was held in 1567 in Debrecen, the main hub of Hungarian Calvinism, where the Second Helvetic Confession was adopted as the official confession of Hungarian Calvinists.