sentences:  Despite the cooperation between the Mongols and their Christian subjects in Antioch, other Christians in the Levant regarded the Mongol approach with unease.Jacques Pantaléon, the Patriarch of Jerusalem, saw the Mongols as a clear threat, and had written to the Pope to warn him about them in 1256.The Franks did, however, send the Dominican David of Ashby to the court of Hulagu in 1260.