Mladen III Šubić of Bribir

Mladen III Šubić (c. 1315–1348) was a grandson of Pavao I, the most powerful Croatian noble of his age; by his time he was almost the last man left to defend the family. From Klis Fortress he held Klis, Omiš and Skradin, his mother Lelka ruling the lands until he came of age in 1332.

He fought the coalition of Split, Trogir and Šibenik under Venice and the nobles led by Ivan Nelipić, forcing the return of Ostrovica in 1335, and by 1344 was the chief opponent of the Hungarian king. Against Louis I he allied with Bosnia in 1338.

In 1348 he took the title Marquess of Slavonia, aiming to end Louis's rule in Croatia, but plague killed him that May. He was buried in Trogir Cathedral, where his epitaph called him the Shield of the Croats.