"Amoghavarśa was a ruler of the Rāṣṭrakūṭa dynasty in the Deccan, and he is probably identical with Amoghavarṣa I, who ascended the throne in ca. 814 A.D. after the death of Govinda III. He is said to have abdicated his throne for becoming a monk." Suniti Kumar Pathak, Vimala-praśnottara-ratnamālā (with Tibetan Version), Journal of the Greater India Society, vol. 17, nos. 1-2 (1958), pp. 92-113, at p. 94.
Bibliography:
Vimalapraśnottararatnamālā (Dri ma med pa'i dris lan rin po che'i phreng ba). Tôh. no. 4333 (also, 4499). Dergé Tanjur, vol. NGO, folios 126r.6-127v.6. Tr. by Kamalagupta and Rin chen bzang po.
There are a large number of ideas about the authorship of this work, on which see Pathak in Mishra, GSBL, p. 82, as well as the introduction to the text by Pathak listed below. The author may be the king Amoghavarṣa I, who was enthroned in about 814. Davidson, IEB, p. 55, says he dates to ca. 814-880.
A nice script edition of both the Sanskrit and the Tibetan is found in Suniti Kumar Pathak, Vimala-praśnottara-ratnamālā (with Tibetan Version), Journal of the Greater India Society, vol. 17, nos. 1-2 (1958), pp. 92-113. Pathak is of the opinion that the element "Vimala" in the title indicates authorship by Vimalacandra, to whom some Jains attributed the work.
Bu ston's History (1989), Catalogue Section, p. 341.6: snyan dngags mkhan don yod 'char gyis mdzad pa'i dri ma med pa'i dris lan rin po che'i phreng ba.
See the discussion in Sternbach, IWSI, p. 105. The original would seem to be Jaina, not Buddhist.
