Robert the Strong
The oldest known Robertians probably originated in the county of Hesbaye, around Tongeren in modern-day Belgium. The first certain ancestor is Robert the Strong count of Paris, probably the son of Robert III of Worms, grandson of Robert of Hesbaye, and nephew of Ermengarde of Hesbaye, who was the daughter of Ingram, and wife of Louis the Pious. Other related family includes Cancor, founder of the Lorsch Abbey, his sister Landrada and her son Saint Chrodogang, archbishop of Metz.