Arnulf I, duke of Bavaria

Arnulf II, also known as the Bad, the Evil or the Wicked, a member of the Luitpolding dynasty, held the title of Duke of Bavaria from about 907 until his death in 937. He is numbered in succession to Arnulf of Carinthia, counted as Arnulf I.

The Duchy of Bavaria was a frontier region in the southeastern part of the Merovingian kingdom from the sixth through the eighth century. It was settled by Bavarian tribes and ruled by dukes (duces) under Frankish overlordship. A new duchy was created from this area during the decline of the Carolingian Empire in the late ninth century. It became one of the stem duchies of the East Frankish realm, which evolved as the Kingdom of Germany and the Holy Roman Empire.