Diocese of Duvno

As the Šubić's were able to issue their own currency, they were wealthy and good taxpayers, so they were allowed to pursue their church policies.

Thus, Pope John XXII calls Mladen II Šubić to remove "the enemies of the Christ's Cross" from Bosnia.

John the Baptist was the Šubićs' patron saint, along with Mary, mother of Jesus, so they consecrated to them the churches and monasteries that they would build.

The proof that the Diocese of Duvno suffered a hard time after Šubićs fall is a testimony of an anonymous Spanish travel writer who in the second quarter of the 14th century wrote that the Catholics are almost non-existent in Bosnia.

In 1345, Madius' successor John de Leoncello was freed from paying a regular fee paid by the diocesan bishops upon their appointment because of poverty.

[9] During the Ottoman conquest of Herzegovina in the 1470s, the bishops of Duvno, who only occasionally resided in the fortress of Rog, were forced to leave their cathedral church.

Finally, in 1477, the fortress of Rog, as well as the wider area of Duvno, became an Ottoman nahiyah in the Sanjak of Herzegovina.

[10] During the Ottoman rule, in order to survive, the bishops of Duvno relied on Franciscans and their own families respectively.

[10] During their missionary activity, the bishops had no official residence on the territory of the diocese and held the religious services around the ruins of the destructed church objects.

[9] During the reign of bishop Pavao Posilović, in 1655, the Franciscan friary of St. Peter in present-day Prozor-Rama was mentioned as the cathedral church of the Diocese of Duvno.

[9] The territory that remained in the Ottoman Empire after the Austro-Turkish War (1716–1718) and signing of the Treaty of Passarowitz in 1718, became part of the Apostolic Vicariate of Bosnia, by the decree of Pope Clement XII of 1735.

A special ecclesiastical province under Ottoman Empire was promoted by the Bosnian Franciscans with the help of the Bishop of Zadar Vicko Zmajević.