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Khazar general of the mid 8th century, sometimes referred to as As Tarkhan, who led an invasion of Abbasid territories in Armenia, Caucasian Albania and northwestern Persia. Scholars have debated over whether Ras Tarkhan is a name or a title. As Tarkhan, used as a title, would mean "general of the Alans", possibly indicating a role as commander of Alan mercenaries or auxiliaries.