Tiberius Julius Theothorses, also known as Thothorses or Fophors (Greek: Τιβέριος Ἰούλιος Θοθωρσης, flourished second half of 3rd century & first half of 4th century – died 309) was a prince and Roman Client King of the Bosporan Kingdom. Theothorses was the second-born son to the Bosporan King Teiranes and his mother was an unnamed woman. He was of Greek, Iranian and Roman ancestry. His elder brother was prince Sauromates IV, who co-ruled briefly with his father before his death in 276. The sons of Theothorses were the last kings to rule the Bosporan Kingdom.