In the first half of the 7th century, Caucasian Albania, as a vassal of the Sasanians, came under nominal Muslim rule due to the Muslim conquest of Persia. The Umayyad Caliphate repulsed both the Sasanians and Byzantines from Transcaucasia and turned Caucasian Albania into a vassal state after Christian resistance led by King Javanshir, was suppressed in 667. The power vacuum left by the decline of the Abbasid Caliphate was filled by numerous local dynasties such as the Sallarids, Sajids, and Shaddadids. At the beginning of the 11th century, the territory was gradually seized by the waves of Oghuz Turks from Central Asia, who adopted a Turkoman ethnonym at the time. The first of these Turkic dynasties established was the Seljuk Empire, who entered the area now known as Azerbaijan by 1067.