 In early 1257 , Aybak was killed in a conspiracy , and was succeeded by his 15 @-@ year @-@ old son , al @-@ Mansur Ali , while Saif ad @-@ Din Qutuz held an influential position . Soon after al @-@ Mansur Ali 's ascendancy rumors of another conspiracy to which an @-@ Nasir Yusuf had an alleged connection emerged . The accused conspirator , al @-@ Mansur Ali 's vizier , Sharaf ad @-@ Din al @-@ Fa 'izi , was strangled by Egyptian authorities . The Bahri Mamluks in Syria led by Baibars pressured an @-@ Nasir Yusuf to intervene by invading Egypt , but he would not act , fearing the Bahri dynasty would usurp his throne if they gained Egypt . 
