Juraj I Šubić was brother of Paul I Šubić of Bribir, who was the most powerful Croatian noble at the end of the 13th century and beginning of the 14th century.
In Dalmatia, Paul appointed his brothers as commissars of Dalmatian cities.
Juraj I Šubić had his seat in Klis Fortress, from where he monitored the coastal cities.
After his death, his brother Mladen I ruled from Klis.
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