 Complete the following phrase:  The Buhturid emirate in the Gharb passed to Muhammads sons Jamal al-Din Hajji II d. 1298 and Sad al-Din Khidr d. 1314 and their fathers cousin, Zayn al-Din Salih d. 1296. Their leadership coincided with a particularly turbulent period in the Levant: the Crusaders had regained their control of the Levantine coastlands amid Ayyubid infighting, the Mamluks had toppled the Ayyubids of Egypt in 1250 and moved to wrest control of their emirates in the Levant, while the Mongols conquered and destroyed the Abbasid Caliphate in Iraq in 1258 and afterward 