http://en.wikipedia.org/wiki/Robert_of_Hesbaye

Robert II, Rodbert or Chrodobert was a Frank, count of Worms and Rheingau and duke of Hesbaye around the year 800. His family is known as Robertians. His son is Robert of Worms and his grandson is Robert the Strong, the namegiver of the Robertians. Robert of Hesbaye is the oldest known ancestor in the line of Robertians that is thought to be certain. He is the great-grandfather of two Frankish kings, Odo and Robert, that ruled in the kingdom of Western Francia. One of his descendants is Hugh Capet, who was the "last Frankish king" and the "first king of France". The descendants of Hugh Capet ruled France until the French Revolution, with a junior line having ruled Spain since 1700.
Ingerman and Cancor are possibly his brothers. Landrada, mother of Saint Chrodogang, archbishop of Metz, is likely his sister. His father may have been named Rodbert or, Chrodobert. He was likely the son of Thuringbert of Worms and Rheingau and grandson of Robert I of Worms and Rheingau, who died in 764.
Ermengarde, wife of emperor Louis the Pious was most likely his niece.