Vishtaspa (fl. 10th century BCE or earlier, if actually historical), the first patron of Zoroaster
The fourth century Ammianus Marcellinus (xxvi.6.32) identifies Zoroaster's patron with another Vishtaspa, better known as Hystaspes in English, the (late-6th century BCE) father of Darius I.
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Goshtasb's brother Zareh (Zareh/Zarer etc., Avestan Zairivairi) is sent to fetch him, but Goshtasb flees to "Rum" (Roman/Byzantine territories) where he marries daughter of the Roman king, becomes a military commander for the emperor, and encourages the emperor to demand tribute from Iran.