The birth date of the new-born knez (prince) in the Frankopan family has not been determined with certainty, but it is assumed to be in the middle of the second half of the 15th century.

Juraj III Frankopan was among those most influential magnates in the country who organized assembly of the Croatian Parliament in his Cetin Castle.

On the contrary, some members of the Frankopan family, especially those of the Modruš–Ozalj branch, were supporters of count Ivan /John/ Zápolya, like some other Croatian noblemen, mostly from Slavonia.

The 1527 election in Cetin confirmed Ferdinand I of Habsburg as King of Croatia, with a charter verified by six Croatian aristocrats and dignitaries, including Juraj III.

There is a commemorative plaque in the church, partially damaged, with the inscription „…jacet in tumba magnificus…“ and the Frankopan coat of arms, which is believed to refer to him.