sentences:  Hulagu and his Christian queen came to be considered as God's agents against the enemies of Christianity, and were compared to the influential 4th-century Christian Emperor Constantine the Great and his revered empress mother, Saint Helen, an icon of the Christian church.The Armenian historian Kyrakos of Gandzak praised the Mongol royal couple in texts for the Armenian Church, and Bar Hebraeus, a bishop of the Syriac Orthodox Church, also referred to them as a Constantine and Helena, writing of Hulagu that nothing could compare to the "king of kings" in "wisdom, high-mindedness, and splendid deeds".After Baghdad, in 1260 the Mongols with their Christian subjects conquered Muslim Syria, domain of the Ayyubid dynasty.