Roman Catholic Diocese of Capodistria

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The Diocese of Capodistria (also Diocese of Capo d'Istria or Diocese of Koper) (Latin: Dioecesis Iustinopolitanus) was a Roman Catholic diocese located in the town of Koper (Capodistria in Italian) in southwestern Slovenia. In 1828, it was united aeque principaliter with the Diocese of Trieste to form the Diocese of Trieste e Capodistria.^[1][2]