Was there a specific name and time given? I always wondered about this. I am asking out of curiosity because Mahaveer, the 24th Tirthankara of Jainism, had a simular mission to Buddha. Mahavir came a little before Buddha but they were both contempories. So I am asking because it could have been either one of those but Mahaveer isn't that well known. Neminath, the 22nd Jina was Krishna's cousin. Not sure if they lived during the same time though but he was mentioned in Rig Veda along with the first Tirthankara.
http://en.wikipedia.org/wiki/Neminath