Duke Frederick II of Austria, also known as Frederick the Warlike, was a prominent nobleman in the 13th century. He ruled as the Duke of Austria from 1230 until his death in 1246. Frederick was a member of the Babenberg dynasty and played a significant role in the political landscape of the Holy Roman Empire during his reign. Frederick II is best known for his military campaigns and efforts to expand his territory. He was involved in various conflicts, including battles against the Hungarians and the Czech forces. His reign ended with his death at the Battle of the Leitha River, which marked a turning point in the history of the Austrian duchy.