Religious peace of Kutná Hora
Religious peace of Kutná Hora (Czech: Kutnohorský náboženský mír) was concluded in March 1485 by the Czech lands Diet in Kutná Hora between Utraquist Hussites and Roman Catholics. The agreement between representatives of both sides, reached after meeting from 13 March to 20 March, declared the agreement from the Basel Council the basic law of the land.
Source: Wikipedia — Religious peace of Kutná Hora (CC BY-SA 4.0)