an-Nasir Yusuf was justifyably concerned about the Mongol peril and had no wish for war with the Franks. Aybak of Egypt also wished to avoid war and in 1255 made a ten years’ truce with the Franks. Jaffa was expressly excluded from the truce, as the sultan wished to secure it as a port for his Palestinian province. The frontier between the parties were subject to constant raids and counter-raids. In January 1256, the Franks captured a large caravan of pack animals. When the Mamluk governor of Jerusalem led an expedition in March to punish the raiders, he was defeated and killed. Aybak made a new treaty with Damascus, again with the caliph’s mediation, ceding Palestine. Both Muslim powers renewed their truces with the Franks, to last ten years and to cover the territory of Jaffa. The Ayyubid dynasty would essentially end with the Siege of Aleppo from 18 January to 24 January 1260 in which the Mongols completed their invasion of the Levant. Later that year, on 3 September 1260, the Mamluks defeated the Mongols at the Battle of Ain Jalut, halting the advance of the Ilkhanate. As the Mamluk dynasty grew in power under Baibars, Louis IX petitioned Clement IV, elected pope in 1265, to go on yet another expedition, the Eighth Crusade. Participants A partial list of those that participated in the Seventh Crusade can be found in the category collections of Christians of the Seventh Crusade and Muslims of the Seventh Crusade. Literary response The failure of the Seventh Crusade engendered several poetic responses from the Occitan troubadours. Austorc d'Aorlhac, composing shortly after the Crusade, was surprised that God would allow Louis IX to be defeated, but not surprised that some Christians would therefore convert to Islam. In a later poem, D'un sirventes m'es gran voluntatz preza, Bernart de Rovenac attacks both James I of Aragon and Henry III of England for neglecting to defend their fiefs that the rei que conquer Suria ( the king who conquered Syria) had possessed. The rei que conquer Suria is a mocking reference to Louis, who was still in Syria in 1254 when Bernart was writing, probably in hopes that the English and Aragonese kings would take advantage of the French monarch's absence. Raoul de Soissons, a trouvère who travelled with the Crusader force wrote several chanson dedicated to Charles I of Anjou. However, Bertran d'Alamanon criticized Charles' neglect