Adinatha
dates unknown, India pre-history
       Adinatha is a unique, mythical name in
    India’s history. I say mythical, not historical,
    because history doesn’t account for such
    things. But Adinatha is like the source of the
    Ganges. The Jainas consider Adinatha their
    first master, their first tirthankara. He has two
    names, Rishabhdeva and Adinatha. He is the
    first tirthankara: hence adi-natha, the original
    master, the one who was first, the one who
    began it. The Jaina tradition was born from
    Adinatha.

    In the Rig Veda Adinatha is mentioned with
    great respect, described in extremely
    respectful terms. Hence he is also given total
    respect in the Hindu tradition. The Hindu
    tradition has not given any respect to
    Mahavira, they have not even mentioned his
    name. If there were no Jaina and Buddhist
    scriptures it would not be possible to know by
    Hindu scriptures alone that Mahavira ever
    existed. But Adinatha has been given great
    respect.

    It seems that the Jaina and Hindu traditions
    became separated only later on. At the time of
    Adinatha they must have been one, no
    differences were obvious. This is why the
    description in the Rig Veda shows respect,
    great respect. And as far as Jainas are
    concerned, he is their first tirthankara. He is
    the very foundation of their whole religion.

    Tantrikas also maintain that Tantra began
    with Adinatha. And Siddha Yogis also maintain
    that Adinatha was their first master. Thus
    Adinatha seems to be the original source. As
    if all the traditions of this country emerged
    and flowed from this one single individual...

                                                – Osho
                                      Die O Yogi Die, ch. 7
aka:  Rishabh Deva

Adinath is a Sanskrit word meaning "first Lord".

Indian semi-legendary god, avatar, teerthankara, ....

Jain religion considers him the first teerthankara, out
of 24

Hindus also consider him a deity
oshobob  The Living Workshop
People in Osho's Talks