Grimoald was the son of
Grimoald was mayor, in effect ruler, of
Austrasia from 643 until 656.
When King Sigebert III died in
656, Grimoald figured he might as well be king since he had
the country already. Grimoald's son and Grimoald's brother-in-law,
Ansegisel, agreed 100%.
Knowing his crew had his back, Grimoald
confined the king's son and successor, Dagobert II, to a
monastery and declared himself king. The nobles of Austrasia were
outraged, arrested the three men, and dragged them before King Clovis II of Neustria,
who executed all three.
Carolingians weren't quite done just yet.
It took another
decade for Ansegisel's son,
Peppin II of Herstal, to grow up.
But when he was done and ready, Peppin brought the power back into
the family lap.