As a later-born son, he received some subordinate castle and manorial dominions in the inheritance decreed by his father in 1246, including the family seat in Châtillon-sur-Marne.

He is last documented in December 1260, when he and his wife made a donation to the nuns of Notre-Dame du Pont.

His wife confirmed a donation made by him (Gavchier de Chastillon Sires de Crecy) to the same religious institution in February 1265.

Apparently, Gaucher IV had already died by this time.

[1] Gaucher IV was married by 1258 at the latest to Isabelle von Lezinnes (d. after 1265) from the Villehardouin family, a great-granddaughter of the chronicler Geoffrey of Villehardouin.