Bilge Khagan
Bilge Khagan, the last of the able Turkic khagans, was already dead and with the death of Suluk, Transoxiana was opened to Arabic conquest. Around this time there was a power shift in the Caliphate, as the Umayyad dynasty was supplanted by the Abbasid dynasty. The policy of the Abbasid Caliphs was more peaceful than that of the Umayyads and Arab control of Transoxiana was limited to the occupation of a few forts.