Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
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.