Guy I, Count of Blois
Guy I of Châtillon, Count of Blois, son of Hugh II of Châtillon and Beatrix of Dampierre, was Count of Blois and Lord of Avesnes 1307-1342.
File:Guy Chatillon st paul 04550.JPG|thumb|right|200px|Seal of Guy I count of Blois: S GUIDONIS DE CASTELLIONE COMITIS SCTI PAULI - SIGILLUM SECRETI MEI
In 1310, he married Margaret of Valois, daughter of Charles of Valois and sister of Philip VI of France. They had three children:
He took part in the expedition of Louis X of France against his uncle Robert III of Flanders in 1315, and in the early stages of the Hundred Years' War.