 The original religion of Iapydes is scarcely known, and it appears to be similar with other eastward Illyrians.They knew the divine pair of water-deities "Vidassus" (as Roman Sylvanus) and "Thana" (as Roman Diana), whose rocky reliefs persist today at some springs in their area.They worshiped the holy horse as their tribal totem, and also the holy snakes as the symbol of their ancestors.