Nicknamed the Pious, Robert (b. c. 972-1031) was the son of Hugh Capet, the namesake of the Capetians, father of Henri, King of France, and father of Adela (or Adelaide), the mother-in-law of William the Conqueror.
Hugh (c. 939-996) is the namesake of the Capetian dynasty, the first king. The Capetians reigned in an all-male succession to 1328. Through collateral lines his descendants ruled up to and after the French Revolution. Text of the oath he swore at his coronation is included.
Hugh (d. 956) was a transitional figure between his father Robert I and mother Beatrix (female descendant of Charlemagne) and his son Hugh Capet, after whom the Capetian dynasty is named.