The Italian Catholic diocese of Ales-Terralba is in Sardinia. It is a suffragan of the archdiocese of Oristano.[1]
Gregory the Great alludes to the episcopal see of Ales (anciently Uselli), in his letter to Januarius of Cagliari in 591. After this nothing is to be found about it until 1147, when the name of Bishop Rello appears in a diploma. The local traditions of Terralba have preserved the memory of a Bishop Mariano, who erected the cathedral about 1144.
The diocese of Ales and diocese of Terralba were united by Pope Julius II, in 1503.[2]
This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed (1913). Catholic Encyclopedia. Robert Appleton Company.