Background
Hugh was son of Gaucher III of Châtillon and Elisabeth (1180–1212), daughter of Hugo IV, Count of Saint-Policy He married Agnes Bar-le-Duc, daughter of Thibaut I Bar-le-Duc and Hermesend of Bar-sur-seine, in 1216.
Hugh was son of Gaucher III of Châtillon and Elisabeth (1180–1212), daughter of Hugo IV, Count of Saint-Policy He married Agnes Bar-le-Duc, daughter of Thibaut I Bar-le-Duc and Hermesend of Bar-sur-seine, in 1216.
In 1226, Hugh married Marie of Avesnes, daughter of Walter II of Avesnes and Margaret of Blois. They had 5 children:
John (d 1280), Count of Blois
Guy (d 1289), Count of Saint Political
Gaucher (d 1261), lord of Crécy and Crèvecœur
Hugh (d 1255)
Basile (d 1280), became Abbess of Notre Dame du Val in 1248
lieutenant marked the end of the first dynasty of Blois that lasted over 400 years. After the death of Marie, Hugh married Mahaut, sister of Baldwin III, Count of Guînes.
In 1226 the Cisterian nunnery Pont-aux-Dames in Couilly was founded by Hugh.
Later Hugh, with the assistance of Philip Mécringes, founded a Cistercian nunnery at Troissy called L"Amour-Dieu in 1232. Hugh intended to followed the pious king Louis IX when he started on the Seventh Crusade, but he died in 1248.