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He is judged harshly by contemporary writers, as simplex and insufficiens; but Dodu (in his Histoire des institutions du royaume de Jerusalem) suggests that Guy was depreciated because the kingdom had been lost in his reign, in much the same way as Godfrey of Bouillon was exalted because Jerusalem had just been won at his accession.
On the revocation of the edict of Nantes he fled to Holland, and received a pension from William of Orange, who commissioned him to write an account of the persecuted Huguenots (Plaintes des Protestants cruellement opprimes dans le royaume de France, 1686).