Roman Catholic Diocese of Castro di Sardegna

The Diocese of Castro di Sardegna (Latin: Dioecesis Castrensis) was a Roman Catholic diocese located in the town of Oschiri in the Province of Sassari in the Italian region of Sardinia.

[1][2] Within the comune of Oschiri is the church of Nostra Signora di Castro, which was once the cathedral episcopal see of a diocese, centred on the now disappeared town of Castro.

The bishopric dates back to Byzantine times (circa 1000 AD), but the earliest mention of a bishop of Castro is of 1116, when an unnamed bishop of the see assisted at the dedication of the Basilica di Saccargia.

In 1164, its bishop Atto dedicated a church in the locality of Aneleto and granted it in the following year to Camaldolese monks.

Castro later decayed, and the bishop's residence was transferred to Bono.