 The matter was reviewed by the 13th Session of the Council of Constance, in 1415; the council rejected the grounds for offering the chalice to lay people and banned the practice.This became the most emblematic issue of the Hussite Wars, which resulted in the permission of the communion under both kinds for Utraquists in Bohemia in 1433 (it would be banned again in 1627 and allowed again by the Patent of Toleration in 1781).In the following century, this was challenged again by the Protestant Reformers, including Martin Luther, John Calvin and Huldrych Zwingli.