The Diocese of Termia or Diocese of Thermae or Diocese of Thermia (Latin: Dioecesis Thermiensis seu Firminiensis) was a Latin Catholic crusader bishopric located in the Cyclades archipelago in the Aegean Sea.
[1][2] It was originally established as the Diocese of Ceo in 1330, before being renamed in 1600.
[2] In 1650, the Cyclades were conquered by the Ottoman Empire and the diocese's activities were suppressed.
The diocese was nominally restored as the Titular Episcopal See of Cea in 1933,[2] and remains listed as such today.
[3] Metropolitan: Archdiocese of Naxos Since the diocese's nominal restoration in 1933, under the name Cea, it has had the following incumbents, so far of the fitting Episcopal (lowest) rank, but is vacant since decades:[2]