In an inscription dated to the "Year 41" (probably of the 2nd century of the Kanishka era) and discovered on the borders of the river Ara in Punjab, he qualifies himself as a Kaisara ("Caesar"), suggesting some awareness of the Roman Empire, and names himself as the son of Vashishka.
- Mario Busssagli, "L'Art du Gandhara", p229
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- From the dated inscription on the Rukhana reliquary
- An Inscribed Silver Buddhist Reliquary of the Time of King Kharaosta and Prince Indravarman, Richard Salomon, Journal of the American Oriental Society, Vol. 116, No. 3 (Jul. - Sep., 1996), pp. 442 
- A Kharosthī Reliquary Inscription of the Time of the Apraca Prince Visnuvarma, by Richard Salomon, South Asian Studies 11 1995, Pages 27-32, Published online: 09 Aug 2010