An ancient hero of the town of Mantua, was a son of Tiberis and Manto, and was also called Ocnus or Aucnus. He is said to have built the town of Mantua, and to have called it after his mother. According to others, Ocnus was a son or brother of Auletes, the founder of Perusia, and emigrated to Gaul, where he built Cesena. (Serv. ad Virg. Ecl. ix. 60, Aen. x. 198.)