George Sursuvul initiated the peace treaty with Byzantine Empire by sending in utmost secrecy an envoy to Constantinople, suggesting a treaty and a marriage-alliance. George Sursubul, heading a delegation of Simeon I’s brother-in-law Symeon, "Calutarkan", courtier "Sampses", and numerous nobility, met with Romanos I in 927 and concluded the peace treaty which ended the Byzantine–Bulgarian war of 913–927. Afterwards, he presided at the marriage ceremony as a witness on the bridegroom’s side, with his counterpart on the Byzantine side being the Byzantine Prime Minister.