Robert was count of Worms and of Rheingau and duke of Hesbaye. He is the earliest certain ancestor of the dynasty known as the Robertians. His son was Robert III of Worms, and his grandson was Robert the Strong. He was eventually the great-grandfather of two Frankish kings, Odo and Robert, both of whom ruled the kingdom of Western Francia.

One of Robert of Hesbaye's male-line descendants was Hugh Capet, the founder of the French royal dynasty which ruled France continuously until 1848, although with a brief interregnum caused by the French revolution and the First French Empire. A junior line has held the Spanish Crown since 1700; the current monarch Felipe VI and his family are direct descendants. Various cadet branches of the Capetian dynasty have ruled other countries including Navarre, Italian states prior to unification, and others.

Gift med
Theoderata, född 765 i Worms, Rheinland-Pfalz, Tyskland, död 788 i Worms, Rheinland-Pfalz, Tyskland.

Barn:
Robert III av Worms, född 785, död 832