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The diocese of Trieste was suffragan of the Patriarchate of Aquileia until 1751. The ecclesiastical province of Aquileia was subject to repeated troubles, both internal and external, due partly to the fact that the eastern dioceses of the province (Istria) were politically subject to Austria, while the western dioceses (Veneto) were subject to the Venetian Republic. Both powers had repeated clashes with the Papacy in policy and administration. The War of the Austrian Succession

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