Chilpéric II, King of the Franks

He was raised as a monk under the name Daniel, but became King of Neustria (715), and sole King of the Franks (719), succeeding Dagobert III. He was the last Merovingian king to exercise independent authority. He allied himself with Eudes of Aquitaine, but was defeated by Charles Martel in a series of wars. In 718 he agreed to appoint Charles Martel as Mayor of the Palace in all the Frankish kingdoms in exchange for recognition as sole King of the Franks. His successors were mere rois fainéants.

http://en.wikipedia.org/wiki/Chilperic_II