and Czech Brothers came to Poland. The former settled in the Vistula Delta where they used their agricultural abilities to turn parts of the delta into plodders. The latter settled mostly in Greater Poland around Leszno. Later on, Socinus and his followers emigrated to Poland. Originally the Reformed Church in Poland included both the Calvinists and the Anti-trinitarians (also known as the Socinians and the Polish Brethren); however, they eventually split due to an inability to reconcile their divergent views on the Trinity. Both Catholics and Orthodox Christians converts became Calvinists and the Anti-Trinitarians. The Commonwealth was unique in Europe in the 16th century for its widespread tolerance confirmed by the Warsaw Confederation. This agreement granted religious toleration to all nobles: peasants living on nobile estates did not receive the same protections. In 1563, the Brest Bible was published (see also Bible translations into Polish). The period of tolerance came under strain during the reign of King Sigismund III Vasa (Zygmunt Wasa). Sigismund, who was also the King of Sweden until deposed, was educated by Jesuits in Sweden before his election as King of the Polish–Lithuanian Commonwealth. During his reign, he selected Catholics for the highest offices in the country. This created resentment amongst the Protestant nobility; however, the country did not experience a religiously motivated civil war. Despite concerted efforts, the nobility rejected efforts to revise or rescind the Confederation of Warsaw, and protected this agreement. The Deluge, a 20-year period of almost continual warfare, marked the turning point in attitudes. During the war with Sweden, when King John Casimir (Jan Kazimierz) fled to Silesia, the Icon of Mary of Częstochowa became the rallying point for military opposition to the Swedish forces. Upon his return to the country Kihn John Casimir crowned Mary a Queen of Poland. Despite these wars against Protestant, Orthodox, and Muslim neighbours, the Confederation of Warsaw held with one notable exception. In the aftermath of the Swedish withdrawal and truce, attitudes throughout the nobility (Catholic, Orthodox, and Protestant) turned against the Polish Brethren. In 1658 the Polish Brethren were forced to leave the country. They were permitted to sell their immovable property and take their movable property; however, it is still unknown whether they received fair-market value for their lands. In 1666, the Sejm banned apostasy from Catholicism to any other religion, under penalty of death. Finally, in 1717, the Silent Sejm banned non-Catholics from