 After he was killed during a raid on Frisia (by a grandson of Clovis I), Hygelac was succeeded by Heardred, according to "Beowulf".The raid to Frisia enabled N. F. S. Grundtvig to approximate the date of Hygelac's death to c. 516, because a raid to France under a King Chlochilaicus, king of the Danes, is mentioned by Gregory of Tours.In that source he is recorded as invading the Frankish Kingdoms during the reign of Theodericus I (died 534), the son of Clovis ("Chlodovechius"), the king of the Franks in the early sixth century, and was killed in the ensuing chaos after the Scandinavian raiders were caught by the sudden appearance of a military response force led by Theodebertus, the son of Theodericus.