Who was Ajitnath Tirthankara in his previous life?

The soul that became Bhagavan Ajitnath, in its earlier incarnation, was the great king Vimalvahan of Susima city in Mahavideh area. He purified his soul to a level where he could earn the Tirthankar-nam-and-gotra-karma. When king Jitshatru became old and wanted to devote the last part his life to spiritual pursuit.