[4] The existing section of the church was then extended to fulfill the needs of the bishop, while the building was renovated during the rule of Zvonimir of Croatia, who also donated the estate of Kosovo to the diocese.

[5] Existing around the same time was a royal Benedictine monastery dedicated to Saint Bartholomew in Kapitul, whose abbots were also in the entourage of the Croatian rulers.

These remains include tablets containing the names of two Croatian kings: Stjepan Držislav, and his successor Svetoslav Suronja, titled as dux Chroatorum on the inscription.

Chronicon breve Regni Croatiae) also claimed that the remains of Croatian king Demetrius Zvonimir were buried here, before the high altar.

[5][7] Due to the threat of Ottoman invasions and the aftermath of the Battle of Krbava Field, the seat of the diocese was relocated to the town of Cazin.

Croatian archaeological pioneer Lujo Marun made an arrangement with construction workers to hand over "anything they find underground, that might seem interesting."

[1]During World War II, Fascist Italian troops completely destroyed the cathedral's remnants to build a barracks.