Answer

The first Tirthankar of Jain Dharma is Bhagwan Rishabhdev, also known as Adinath Bhagwan.

Explanation

He is called Adinath because “Adi” means first, and “Nath” means Lord. Bhagwan Rishabhdev was the first Tirthankar of the present time cycle.

Takeaway

Bhagwan Rishabhdev established the path of liberation through right faith, right knowledge, and right conduct.