Smbat had fought off an invasion launched by the emir of Azerbaijan ( Iran ) , Yusuf Ibn Abi'l - Saj .
When Smbat surrendered Smbat was tortured and beheaded by Yusuf Ibn Abi'l - Saj in Yernjak .
Smbat had fought off an invasion launched by the emir of Azerbaijan ( Iran ) , Yusuf Ibn Abi'l - Saj , but when Smbat surrendered he was tortured and beheaded by Yusuf in Yernjak .