Passages in the "Frawardin Yasht" ("Yt. " 13. 99–103) and elsewhere have enabled commentators to infer family connections between Vishtaspa and several other figures named in the Avesta. The summaries of several lost Avestan texts ("Wishtasp sast nask", "Spand nask", "Chihrdad nask", and "Varshtmansar nask"), as reported in the "Denkard" (respectively 8. 11, 8. 13, 8. 14, and 9. 33. 5), suggest that there once existed a detailed "history" of Vishtaspa and his ancestors in scripture. The "Yasht" 13 mentions Zairiuuairi, Piší šiiaoθna (Vishtaspa's eschatological son Pišišōtan), Spəṇtōδāta (Spandyād), Bastauuairi (Bastwar), Kauuarazman, Frašaoštra and Jāmāspa (the Huuōguua brothers in the Gathas), all of whom are featured in the Pahlavi narrative about the war between Vishtaspa and Arzāsp (Arjāsp, king of the Xiiaonas). In "Yasht" 9.31, Vishtaspa prays to Druuāspā that he may successfully fight and kill various opponents and, apparently, turn Humaiiā and Varəδakanā away from the lands of the Xiiaonas.