The last Merovingian king of the Franks (743–751), a powerless figurehead deposed and tonsured by Pepin the Short, ending three centuries of Merovingian rule.
Childeric III was the last king of the Merovingian dynasty, which had ruled the Franks since the days of Clovis nearly three centuries before. He was a puppet from the start: raised to the throne in 743 by the Carolingian mayors of the palace, Pepin the Short and his brother Carloman, after the office had stood vacant for seven years, precisely because they needed a Merovingian figurehead to legitimise their own rule.
By his reign the Merovingian kings had become mere ceremonial relics, "do-nothing kings" without lands, power, or authority, while the mayors governed. In 751, having consolidated his power and secured the blessing of the pope, Pepin the Short deposed Childeric, had him tonsured as a monk, and took the crown himself — ending the Merovingian line and beginning the Carolingian monarchy.
Childeric was born about 717, a Merovingian of uncertain parentage — later doubts even questioned whether he truly belonged to the royal line. For seven years after 737 the Frankish throne had simply stood empty, the mayors ruling without a king; but in 743 Pepin the Short and Carloman, needing the sanction that only an anointed Merovingian could give, found Childeric and set him on the throne.
Childeric III has no recorded character worth the name, and that is precisely the point of him: he was chosen to be a nonentity. The whole Merovingian kingship had by his day been reduced, in the famous description of Einhard, to a king who did nothing but sit on the throne with his long hair and flowing beard, receive ambassadors, and give the answers he had been taught, possessing nothing of his own but an empty title and a precarious income.
Childeric embodied this hollowed-out royalty completely. He was a figurehead lifted from obscurity to lend the mask of legitimacy to the men who really ruled, and then discarded when he was no longer needed. His historical significance lies entirely in his deposition — the moment when the Carolingians judged the Merovingian fiction no longer worth maintaining and swept it away.
For eight years Childeric reigned as the last Merovingian, a ceremonial king while Pepin the Short governed as mayor of the palace. But Pepin, now sole master of the Franks, wished for the reality and the name of kingship to coincide. He appealed to Pope Zacharias with the pointed question of whether it was right that a man with no power should bear the royal title — and the pope answered that he who held the power should also be king.
With that sanction, in 751 Pepin deposed Childeric. The last Merovingian was shorn of his long royal hair — the symbol of his sacred kingship — and shut up in a monastery, while Pepin was raised on the shield and anointed king of the Franks, founding the Carolingian dynasty.
Childeric lived out his remaining years as a monk and died about 754. His young son Theuderic was likewise tonsured, extinguishing the direct Merovingian line.
Childeric III is remembered as the last of the Merovingians, the dynasty that had founded the Frankish kingdom under Clovis. His deposition in 751 was one of the great turning points of early medieval history: it transferred the Frankish crown to the Carolingians, bound the new dynasty to the papacy that had blessed the change, and set in motion the chain of events that would lead to Charlemagne's empire and the shape of medieval Europe.