Merovingian (adj.)

"of or pertaining to the dynasty to which the first French kings belonged," 1690s, from French Mérovingien, from Medieval Latin Merovingi, "descendants of Meroveus," (mythical?) ancestor of the line of Frankish kings in Gaul c. 500-752 beginning with Clovis; Merovingi is a Latinization of his Germanic name (compare Old High German Mar-wig "famed-fight") with the Germanic patronymic suffix -ing.