Answer

In Jain tradition, the first and oldest Jain figure is Lord Rishabhdev, also called Adinath. He is regarded as the first Tirthankar and the one who first established the Jain way of life in this era.

Explanation

If you mean the first Jain spiritual figure, the answer is Rishabhdev.

If you mean the first Jain monk/ascetic, Jain tradition also connects the beginning of ascetic life to Lord Rishabhdev, because he is believed to have introduced renunciation, discipline, and monastic conduct to humanity.

So, in simple terms:

• First Tirthankar: Rishabhdev (Adinath)
• Oldest revered Jain figure: Rishabhdev
• Earliest source of Jain monk tradition: Rishabhdev

Spiritual Understanding

Rishabhdev is important because he represents:

• the beginning of Jain spiritual guidance,
• the ideal of renunciation,
• the foundation of self-discipline and non-violence,
• and the origin of organized spiritual life in Jain Dharma.

Takeaway

If someone asks for the first official Jain figure, the traditional Jain answer is Lord Rishabhdev (Adinath). If you want, I can also explain the difference between Tirthankar, monk, Acharya, and Shraman in Jainism.