He served under his brother-in-law Lucullus in Asia (72 B.C.) and was commissioned to deliver the ultimatum to Tigranes, which gave him the choice of war with Rome or the surrender of Mithradates.
He then assumed the command of the army and obtained several successes against Mithradates, whom he shut up in Pitane on the coast of Aeolis, and would undoubtedly have captured him had Lucullus co-operated with the fleet.
In the autumn of 73 Lucullus marched to Cabeira or Neocaesarea, where the king had gone into winter quarters with a vague hope that his son-in-law, Tigranes, king of Armenia, and possibly even the Parthians, might come to his aid.
Sulla returned to Rome, while Lucullus remained in Asia, and by wise and generous financial reforms laid the foundation of the prosperity of the province.
When Lucullus assumed the command of the Roman troops in Asia, Caesar returned to Rome, to find that he had been elected to a seat on the college of pontifices left vacant by the death of his uncle, C. Aurelius Cotta.
LUCIUS LICINIUS LUCULLUS (c. i io-56), surnamed Ponticus from his victories in Asia Minor over Mithradates VI.
The first consisted of two books, in which Catulus and Lucullus were the chief speakers.
The lost territory, however, was recovered by Phraates III., and Mesopotamia was guaranteed to Parthia by the treaties of Lucullus and Pompey (66 B.C.).
Under Tigranes of Armenia they became his vassals, and after the victories of Lucullus and Pompey, vassals of the Romans.
The campaigns of Lucullus and Pompey brought Rome into delicate relations with Parthia.