Rudolf I, Margrave of Hachberg-Sausenberg

Margrave Rudolf I of Hachberg-Sausenberg was the son of Margrave Henry II of Hachberg and Anne of Üsenberg. He married in 1298 or 1299 to Agnes, the heiress of Otto of Rötteln. In 1306 he founded the side-line Hachberg-Sausenberg at Sausenburg Castle, a castle which the Margraves of Hachberg had built in 1240 on top of Mount Sausenberg. His elder brother Henry III continued the main Baden-Hachberg line at Hochburg castle in Emmendingen.