The first one was given by Gjuro Szabo, a Croatian historian, who interprets that the bed of the river Kosteljina, which passes through the town, was blocked by some kind of partition, and that's how the place got its name (pregrada = en.

The second version originates from Maristele Sabljić who says that the owner of Kostel, Prince George of Brandenburg (Juraj Branderbuški), stationed his defense companies "in front of the city" (cro.

Due to his extravagant lifestyle, the prince had to sell the manor in 1523., which was then bought by Petar Keglević, ban of Jajce, for 13,000 forints.

Kostelgrad is a medieval fortress located north of Pregrada in a strategic position that enabled the control of roads from different sides.

[7] A story about the time when Petar Keglević, who achieved the greatest honor as a Croatian ban (1537–1542), acquired Kostelgrad says that he armed his subjects and with his guard became the fear and terror of the Styrian and German merchants who came to these parts.

Despite all the ups and downs, the family kept its headquarters in Kostelgrad, where Petar died in 1554 and was buried in the parish church in Pregrada.