The House of Clermont is a noble family of the French region of Picardy dating from the 10th century and included both the early counts of Clermont-en-Beauvaisis as well as many Constables of France.
Among their children were: Renaud II, Count of Clermont-en-Beuavaisis, son of Hugh, was the next prominent member of the House of Clermont.
Renaud took the Cross as part of the First Crusade and participated in the siege of Nicaea and the Battle of Dorylaeum in 1097.
Simon II of Clermont-Nesle (1210–1286) was Seigneur of Ailly, Maulette and (jure uxoris) of Nesle.
The descendants of Simon II and Raoul III continued the House of Clermont for many subsequent generations, playing a major role in the later medieval country of France.