Research Notes:

Otmond de Chaumont, II. du nom, prit les armes avec son pere en 1137, contre Etienne, Roi d'Angleterre, pour venger la ruine du château de Quitry. Il laissa de sa femme, dont on ignore le nom, Robert de Chaumont, dit le Roux, qui suit....

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Orderic Vitalis records that in 1137 King Stephen destroyed "munitionem Chitreii...spelunca latronum" [castle of Guitry, den of thieves] and "Guillelmus de Calvimonte cum Odmundo filio suo" rebelled. It is assumed that this Osmond was a different person from Osmond who subscribed the 1175 charter of Isabelle, as the second Osmond signed last in the list of subscribers indicating junior status.... ³