Tigranes the Younger was the son and heir of the Artaxiad king of Armenia, Tigranes II of Armenia (r. 95–55 BC). His mother
was Cleopatra of Pontus, a daughter of Mithridates VI Eupator (r. 120–63 BC), the king of Pontus. In c. 66 BC, Tigranes the
Younger fell out with his father and fled to the court of the Parthian monarch Phraates III (r. 69–57 BC). Phraates, together
with Tigranes the Younger, led an expedition into Armenia. Ultimately, Tigranes the Younger was defeated by his father, however,
leading him to join Pompey instead. Tigranes the Elder soon surrendered to Pompey, who chose to allow him to retain his crown.
Instead, Tigranes the Younger was made the ruler of Sophene.