In 1289, Arghun sent a third mission to Europe, in the person of Buscarel of Gisolfe, a Genoese who had settled in Persia. The objective of the mission was to determine at what date concerted Christian and Mongol efforts could start. Arghun committed to march his troops as soon as the Crusaders had disembarked at Saint-Jean-d'Acre. Buscarel was in Rome between July 15 and September 30, 1289, and in Paris in November–December 1289. He remitted a letter from Arghun to Philippe le Bel, answering to Philippe's own letter and promises, offering the city of Jerusalem as a potential prize, and attempting to fix the date of the offensive from the winter of 1290 to spring of 1291: