The Kalpa-Sutra ascribed to Bhadrabahu (third century BC) shows that the four Tirthankaras; Rishabhanatha, Neminatha, Parshvanatha and Mahavira; were celebrated by Jains during the early stage of development of Jainism.
Neminatha was the predecessor of Parshvanatha, 84,000 years earlier, and 22nd Tirthankara of the Jain tradition.