Lewis & Short

Vologēsus, i, and Vologēses, is or i, m., the name of several kings of Parthia, of the house of the Arsacidœ; form Vologēsus, Suet. Ner. 57, 1; id. Vesp. 6; id. Dom. 2; Plin. 6, 26, 30, § 123; form Vologēses, Tac. A. 12, 14; 12, 44; 12, 50.