In 687, after victory over the western kingdom of Neustria, the Austrasian mayor, Pippin of Herstal, took the title Duke of the Franks to signify his augmented rule. His son and successor, Charles Martel, ruled without elevating a new king during the last four years of his reign (737-741). His sons Carloman and Pepin the Younger elevated another Merovingian king, Childeric III, but he was eventually deposed in 751 by Pepin, who was crowned king in his place.