Map of the Diocese of Egypt in antiquity The diocese of Ammonia ( la, Dioecesis Ammoniacensis, link=no) is a suppressed and

titular see A titular see in various churches is an episcopal see of a former diocese that no longer functions, sometimes called a "dead diocese". The ordinary or hierarch of such a see may be styled a "titular metropolitan" (highest rank), "titular archbish ...

of the

Roman Catholic Church The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...

. It is all that remains of the ancient bishopric that was centered the

Siwa Oasis The Siwa Oasis ( ar, واحة سيوة, ''Wāḥat Sīwah,'' ) is an urban oasis in Egypt; between the Qattara Depression and the Great Sand Sea in the Western Desert (Egypt), Western Desert, 50 km (30 mi) east of the Libyan Egypt–Li ...

during

late antiquity Late antiquity is the time of transition from classical antiquity to the Middle Ages, generally spanning the 3rd–7th century in Europe and adjacent areas bordering the Mediterranean Basin. The popularization of this periodization in English ha ...

, when it was in the

Roman province The Roman provinces (Latin: ''provincia'', pl. ''provinciae'') were the administrative regions of Ancient Rome outside Roman Italy that were controlled by the Romans under the Roman Republic and later the Roman Empire. Each province was rule ...

of Marmarica and suffraged by the archdiocese of Darni. Today Ammoniace survives as a

titular bishop A titular bishop in various churches is a bishop who is not in charge of a diocese. By definition, a bishop is an "overseer" of a community of the faithful, so when a priest is ordained a bishop, the tradition of the Catholic, Eastern Orthodox an ...

ric and has been vacant since January 24, 1983.David Cheney, Diocese of Ammoniace
at Catholic-Hierarchy.org.

References

Catholic titular sees in Africa Former Roman Catholic dioceses in Africa Ammoniace {{africa-RC-diocese-stub