Guido de Bres was a 16th-century Belgian pastor and theologian, best known for his role in the development of the Reformed Church in the Low Countries. He was born around 1522 and became a prominent figure in the Protestant Reformation, advocating for Calvinist beliefs and practices. De Bres is particularly famous for writing the Belgic Confession in 1561, a key document that outlines the core beliefs of the Reformed faith. His work helped unify Protestant communities in the region and provided a foundation for future theological discussions. He was martyred in 1567 for his faith, solidifying his legacy as a significant figure in the Reformation.