Caspar Hedio, also written as Kaspar Hedio, Kaspar Heyd, Kaspar Bock or Kaspar Böckel (Ettlingen, 1494 - Strasbourg, 17 October 1552) was a German historian, theologian and Protestant reformer. He was born into a prosperous family and attended a famous school in Pforzheim. In 1513. he began his studies in Fribourg and later studied theology in Basel, where he received his degree in 1519. At that time, he began his relationship with Ulrich Zwingli and corresponded with Martin Luther. He took his doctorate in Mainz and obtained a position as a preacher at the Strasbourg Cathedral in 1523. His Protestant convictions were made clear when he married Margarete Trenz.