- Established as Titular Episcopal See of Iassus (latine) / Iasso (Italiano) / Iasos (latine)
- 1924: Renamed as Titular Episcopal See of Iassus (latine) / Iasso (Italiano) / Ioasos (latine)
- 1925: Renamed as Titular Episcopal See of Iasus (latine) / Iaso (Italiano) / Iasso (Italiano)
- 1928: Renamed as Titular Episcopal See of Iasus (latine) / Jaso (Italiano) / Jasso (Italiano)
- 1929: Renamed as Titular Episcopal See of Jasus (latine) / Jaso (Italiano) / Jasso (Italiano)
- 1971: Renamed as Titular Episcopal See of Iasus (latine) / Jaso (Italiano) / Iasen(sis) (Latin)