|jure uxoris Count of Blois|
|Died||9 April 1248|
|Spouse(s)||Agnes of Bar-le-Duc|
(m. 1216; died c. 1225)
(m. 1226; died 1241)
Mahaut of Guînes
|Father||Gaucher III of Châtillon|
|Mother||Elisabeth of Saint-Pol|
Hugh was son of Gaucher III of Châtillon and Elisabeth, daughter of Hugo IV, Count of Saint-Pol. He married Agnes of Bar-le-Duc, daughter of Thibaut I of Bar-le-Duc and Hermesend of Bar-sur-Seine, in 1216. By 1225, Agnes was dead and Hugh married Marie.
- John I (d. 1280), Count of Blois
- Guy III (d. 1289), Count of Saint Pol
- Gaucher IV (d. 1261), lord of Chatillon, Crécy and Crèvecœur. His son was: Gaucher V de Châtillon.
- Hugh (d. 1255)
- Basile (d. 1280), became Abbess of Notre Dame du Val in 1248
Through his marriage Hugh became the first Count of Blois from the House of Châtillon. It 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.
- Theodore Evergates, The Aristocracy in the County of Champagne, 1100-1300, (University of Pennsylvania Press, 2007), 223.
- Theodore Evergates, The Aristocracy in the County of Champagne, 1100-1300, 254.
- Anne E. Lester, Creating Cistercian Nuns: The Women's Religious Movement and Its Reform in Thirteenth Century Champagne, (Cornell University Press, 2011), 157-158.