Prince Suleiman I returned to Constantinople after a religious pilgrimage and attended a cultural exposition at Topkapı Palace. Unbeknownst to him, the Byzantine Templars had concocted a plan to kill Suleiman at his own party.
Fortunately, Ezio Auditore da Firenze and the Turkish Assassins led by Yusuf Tazim unearthed their scheme and infiltrated the exposition dressed as minstrels. Their disguises proved to be a great distraction and allowed Suleiman's Templar attackers to be identified and disposed of.
When Ezio and the other Assassins were discovered by the Prince's guard, a battle ensued. It ended when Ezio assassinated Suleiman's last attacker, which proved his faction's innocence and began a beneficial friendship between himself and the Prince.