. "Iberia" . "Khazar invasion of Transcaucasia" . "Siege of Derbent" . . "Siege of Tbilisi" . . "sack of Derbent" . "Turco-Byzantine victory" . . . . . "Third Perso-Turkic War" . . . . . . . "ravage their territories" . . . . . . "Third Perso-Turkic War" . . "Tbilisi was sacked" . "attacked" . "Third Perso-Turkic War#Siege of Tblilisi" . . "Western Turkic Khaganate" . "assistance" . "sacked" . . . "Sasanian Empire" . . . . "Byzantine Empire" . "Third Perso-Turkic war" . . . "conquered most of Armenia" . . . "allied with Turks" . . . . . "invaded Persian Transcaucasia" .