The Catholic diocese of Tinin (Italian), or diocese of Knin (Croatian placename) was in Dalmatia (now Croatia). It existed from the eleventh century to 1622, when the Ottoman conquest of Knin drove out the bishops.
It then effectively became a titular see, though this status is not entirely clear. It may notionally have continued, suffragan to the archdiocese of Kalocsa-Bacs.[1]
At the request of Casimir of Croatia in 1050, a Bishopric of Knin was created, suffragan to the archdiocese of Spalato; the bishop seems to have been attached to the court as preacher. Daniele Farlati in his Illyricum sacrum, IV (Venice, 1775), gives a history of the prelates of Knin, from Mark in 1050 to Joseph in 1755. The residential succession was interrupted by the invasion in 1622.
When Venice captured the district in 1768, the Bishop of Sebenico was appointed to administer the diocese, which was united in 1828 to Sebenico (today the Roman Catholic Diocese of Šibenik). The ruins of the old Cathedral of St. John the Evangelist are still visible.