The Unity of the Brethren, also known as Czech or Bohemian Brethren, is a Christian denomination whose roots are in the pre-reformation work of priest and philosopher Jan Hus, who was martyred in 1415. The reforms of Jan Hus, which included providing the Scriptures to the people in their own language and making both elements of communion available to the people, were popular with the Czech people, but met extreme opposition from church authorities. Hus was executed, but his preaching and writings were instrumental in the formation of the Hussite movement. The Hussite movement broke into several strands, one of which (the smallest) became known as the Unity of the Brethren. The roots of this radical and pacifistic stream within the early Hussite movement go back to Petr Chelick.