Rusaddir is a Catholic titular see

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 bishop", "titular metropolitan", or "titular archbishop"....

. The original diocese was in Mauritania Tingitana, with see at what is now Melilla

Melilla

Melilla is a autonomous city of Spain and an exclave on the north coast of Morocco. Melilla, along with the Spanish exclave Ceuta, is one of the two Spanish territories located in mainland Africa...

 in Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

. Rusaddir (Rusadir) was a Phoenicia

Phoenicia

Phoenicia , was an ancient civilization in Canaan which covered most of the western, coastal part of the Fertile Crescent. Several major Phoenician cities were built on the coastline of the Mediterranean. It was an enterprising maritime trading culture that spread across the Mediterranean from 1550...

n settlement, and the name means a high cape.

This city is mentioned by Ptolemy

Ptolemy

Claudius Ptolemy , was a Roman citizen of Egypt who wrote in Greek. He was a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in Egypt under Roman rule, and is believed to have been born in the town of Ptolemais Hermiou in the...

 (IV, 1) and Pliny (V, 18) who call it "oppidum et portus", also by Mela

Mela

Mela is a Sanskrit word meaning 'gathering' or 'to meet' or a Fair. It is used in the Indian subcontinent for all sizes of gathering and can be religious, commercial, cultural or sports. In rural traditions melas or village fairs were of great importance...

 (I, 33), under the corrupted form Rusicada and by the Itinerarium Antonini. During the Middle Ages it was the Berber city of Mlila. It is now Melilla

Melilla

Melilla is a autonomous city of Spain and an exclave on the north coast of Morocco. Melilla, along with the Spanish exclave Ceuta, is one of the two Spanish territories located in mainland Africa...

.

There is no record of any bishop of this see.