 In 1274 Pope Gregory X convened the Second Council of Lyon . Abaqa sent a delegation of 13 to 16 Mongols to the Council , which created a great stir , particularly when three of their members underwent a public baptism . Abaqa 's Latin secretary Rychaldus delivered a report to the Council which outlined previous European @-@ Ilkhanid relations under Abaqa 's father , Hulagu , affirming that after Hulagu had welcomed Christian ambassadors to his court , he had agreed to exempt Latin Christians from taxes and charges , in exchange for their prayers for the Khan . According to Rychaldus , Hulagu had also prohibited the molestation of Frank establishments , and had committed to return Jerusalem to the Franks . Rychaldus assured the assembly that even after Hulagu 's death , his son Abaqa was still determined to drive the Mamluks from Syria . 
