At the Mongol camp near Kars, André had met a certain David, who in December 1248 appeared at the court of King Louis IX of France in Cyprus. André, who was now with the French King, interpreted David's, a real or pretended offer of alliance from the Mongol general Eljigidei, and a proposal of a joint attack upon the Islamic powers of Syria. In reply to this the French sovereign dispatched André as his ambassador to Güyük Khan. Longjumeau went with his brother Jacques (also a Dominican) and several others – John Goderiche, John of Carcassonne, Herbert "Le Sommelier", Gerbert of Sens, Robert (a clerk), a certain William, and an unnamed clerk of Poissy.