Padmagupta's "Nava-sahasanka-charita" is based on the life of Sindhuraja, but is of little historical value. The legend is not mentioned in earlier Paramara inscriptions (such as the Harsola copper plates) or literary works (such as Halayudha's "Mritasanjivani"). Therefore, it appears that Padmagupta invented the legend in late 10th century. By this time, all of the Paramaras' neighbouring dynasties claimed descent from mythical heroes or gods: the Pratiharas from Lakshmana, the Chahamanas (Chauhans) from Surya (Sun), the Chaulukyas from Brahma's water pot ("chaluka"), and the Chandelas from Chandra (Moon). The Paramaras were the only ones without a legend of mythical origin. This might have motivated Padmagupta to invent a new legend with Sindhuraja's approval.