According to the "Mahavamsa", Bindusara appointed Ashoka as the viceroy of present-day Ujjain (Ujjeni), which was an important administrative and commercial centre in the Avanti province of central India. This tradition is corroborated by the Saru Maru inscription discovered in central India; this inscription states that he visited the place as a prince. Ashoka's own rock edict mentions the presence of a prince viceroy at Ujjain during his reign, which further supports the tradition that he himself served as a viceroy at Ujjain.