Robert de Châtillon, bishop of Laon

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ROBERT de Châtillon (-1215). Guy de Châtillon and Gaucher his brother made a donation to the priory of Longueau, with the consent of Robert also his brother, by charter dated 1189[821]. The Chronicle of Alberic de Trois-Fontaines in 1216 records the death of "episcopus Laudunensis Robertus frater comitis de sanctro Paulo", in a later passage specifying that he was the son of "Guido de Castellione" & his wife[822]. Bishop of Laon 1210. The Chronicle of Alberic de Trois-Fontaines records the death in 1216 of “episcopus Laudunensis Robertus frater comitis de Sancto Paulo” and the succession of “Anselmus”[823]. https://fmg.ac/Projects/MedLands/chamchalons.htm#RobertChatillonLao...

Not bishop of Langres, that was a different Robert of unknown family.