Rishabhdeva,
who is also known as adinath, is the founder of the Tirthankara sect of Jainism.
Tirthankaras Rishabhdeva and aristanemi are mentioned in Rigveda.
The 23rd Tirthankara, parsvanath, was the son of king Asvasena of Banaras. He became an ascetic at the age of 30 and got enlightenment after 84 days of penance.