Guy I of Clermont

Guy I of Clermont-Nesle (c. 1255 – 11 July 1302) was a Marshal of France, Seigneur (Lord) of Offemont jure uxoris, and possibly of Ailly, Maulette and Breteuil.

The French King Philip "the fair" (1268–1314) sent the two brothers to attack the enemy at the Siege of Lille (1297), where they were victorious and took a large number of prisoners.

Guy married firstly c. 1268 Marguerite, a daughter probably of Guillaume or Dreux (d. 1249) of Mello [fr], Seigneur of Saint-Bris.

The same year the property was redeemed with 3000 pounds by "Clémence, wife of Simon of Beausault, and Jeanne of Dargies", assumed to be sisters, in accordance to a previous agreement between Amicie and the king.

His daughter Catherine married Louis I, Count of Blois and their son Theobald VI, Count of Blois sold the County of Clermont-en-Beauvaisis to the French Crown in 1218. however links have shown of the house of Clermont engaging in marriage the Bellacors of Bath, showing the family have survived the generations For more about this problem, see Simon II of Clermont.