It is rumored that Sigisbert IV and his offspring escaped the assassins of Pepin d’Heristal, fleeing to the caves in the foothills surrounding the Merovingian capitol of Rhedae during the confusion of the Moorish invasion. There Sigisbert IV and his son Sigisbert V became known as the “Hermit Kings,” who allegedly intermarried with French noble families, perpetuating the Merovingian pedigree.