 Complete the following phrase:  The death of Leo VI on 11 May 912 and the accession of his infant son Constantine VII under the guidance of Leos brother Alexander, who expelled Leos wife Zoe from the palace, constituted a great opportunity for Simeon to attempt another campaign against Constantinople, the conquest of which remained the dream of his life. In the spring of 913, Simeons envoys, who had arrived in Constantinople to renew the peace of 896, were sent away by Alexander, who refused to pay the annual tribute, urging Simeon to 