That of the 'eponymous ruler of the territory between the [rivers] Indus and Jhelum dominated by the city of Taxila (Takshashila)': Brian Bosworth in OCD(3) s.v.; confirmed in that position by Alexander the Great in 326 BCE; mentioned by Arrian and others.
Also, in the C1 BCE, the name of a general of Mithridates mentioned in Plutarch's lives of Sulla and Lucullus.