
1) Greek war deity
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https://www.crosswordclues.com/clue/perses
[Titan] PersesPronunciation-needed (Πέρσης) was the son of the Titan siblings, Crius and Eurybia. He was described as the Titan god of destruction in mythology. He was wed to Asteria, his cousin, daughter of Titans Phoebe and Coeus. They had one child noted in mythology, Hecate, honoured by Zeus above all others as the goddess of wild...
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http://en.wikipedia.org/wiki/Perses_(Titan)
[brother of Aeetes] In Greek mythology, Perses was the brother of Aeetes (which makes him a son of Helios, persumably by Perse the Oceanid). He usurped the throne of Colchis from his brother, but was subsequently slain by Medea, his niece. He is not to be confused with the Titan known as Perses, who is known for fathering Hecate. ...
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http://en.wikipedia.org/wiki/Perses_(brother_of_Aeetes)
[brother of Hesiod] Perses was the brother of Hesiod. He is mentioned several times in the Works and Days. Perses plays the role of Hesiod`s less-than-responsible brother, foolishly handling an inheritance given to him by the ruling of unjust judges. ...
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http://en.wikipedia.org/wiki/Perses_(brother_of_Hesiod)

(from the article `Mithraism`) The initiates were organized in seven grades: corax, Raven; nymphus, Bridegroom; miles, Soldier; leo, Lion; Perses, Persian; heliodromus, Courier of ... In the Mithraic ceremonies, there were seven degrees of initiations: Corax (Raven), Nymphus (Bridegroom), Miles (Soldier), Leo (Lion), Perses ... [2 re...
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http://www.britannica.com/eb/a-z/p/47

Titan husband of Asteria and father of Hecate; a god of destruction. Also, a son of Andromeda and Perseus and a brother of Hesiod (see the Works and Days).
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http://www.chalquist.com/writings/greekmyth/
No exact match found.