Simon II of Clermont, Seigneur of Nesle through his mother Gertrude, was regent of the kingdom of France during the second crusade of Saint Louis. &lt;a href="Raoul%20II%20of%20Clermont"&gt;Raoul II/III of Clermont&lt;/a&gt;, constable of France, and Guy I and Guy II (d. 1352) of Clermont, both marshals of France, were members of the family. The brothers Raoul and Guy I were both notable casualties of the Battle of the Golden Spurs 1302, a French military disaster in the County of Flanders in the Franco-Flemish War (1297-1305).