Between 1541 and 1545, the Diets (or legislative assemblies) in the eastern Hungarian Kingdom re-affirmed the agreement that the Hungarian noblemen, Transylvanian Saxons, and Székelys had signed during the Transylvanian peasant revolt in 1437, making this "Union of the Three Nations" a fundamental law. The Diets decreed that each nation could freely regulate its internal affairs at its own assemblies. The Saxons regarded religious issues as an internal affair, and their general assembly ordered the introduction of the Reformation in their towns and villages in 1544–1545. Lutheran ideas also spread among the noblemen from the 1540s. Twenty-nine Hungarian preachers from the region of Várad (now Oradea in Romania) adopted a creed similar to the Augsburg Confession at their synod in Erdőd (now Ardud in Romania) in 1545.