https://en.wikipedia.org/wiki/Vishtaspa

I first found this information in a book “Religion” ISBN 978-1-4351-2132-4

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I require much more data before I call this entry “Credibility.” Consider this a placeholder.  

In Yasht 9.30, Vishtaspa himself appeals for the ability to drive off the attacks of the daeva-worshipping Arejat.aspa and other members of drujvant Hyaona family. Similarly in Yasht 5. 109, Vishtaspa pleads for strength that he may “crush Tathryavant of the bad religion, the daeva-worshipper Peshana, and the wicked Arejataspa.”^[6] Elsewhere (Yt. 5. 112–113), Vishtaspa also pleads for strength on behalf of Zairivairi (Pahl. Zarēr), who in later tradition is said to be Vishtaspa’s younger brother.^[1] The allusions to conflicts (perhaps battles, see below) are again obliquely referred to in Yasht 13. 99–100, in which the fravashis of Zoroaster and Vishtaspa are described as victorious combatants for Asha, and the rescuers and furtherers of the religion. This description is repeated in Yasht 19. 84–87, where Zoroaster, Vishtaspa and Vishtaspa’s ancestors are additionally said to possess khvarenah.^[7] While the chief hero of the conflicts is said to be Vishtaspa’s son, Spentodhata, (Yt. 13. 103)^[6] in Yasht 13. 100, Vishtaspa is proclaimed to have set his adopted faith “in the place of honor” amongst peoples.^[8][9]