Maternus of Cologne

Maternus (c. 285 – September 14, 315 AD), also known as Maternus II, was the first known bishop of Cologne, reportedly also the third bishop of Trier, and founder of the diocese of Tongeren. He is venerated as a saint in the Catholic and Eastern Orthodox churches. The Basilica of Saint Maternus in Walcourt, Belgium was allegedly founded by him.