The Siege of Artaxata took place in 66 BC in the modern Artashat on the Araxes River near Yerevan, a place of course far to the north of the Artaxata.

The siege was organized by the Tigranes the Younger and Phraates III.

Initially successful, their efforts were halted by a long siege at Artaxata, which led Phraates III to put Tigranes the Younger in charge of the expedition, leaving him with some Parthian soldiers[6][7][8][9] went home when his siege of Artaxata dragged on, and Tigranes defeated[10][11] his son's remaining forces.

Tigranes the Younger took refuge with the Roman general Pompey,[8][12] obliging his fauier to buy Pompey off.

When Phraates occupied Gordyene the following year, Pompey recovered it for Tigranes.