The first Tirthankar is Rishabhanatha, also known as Adinath. He is the founder or first teacher in Jainism and stands at the head of the 24 Tirthankaras in the current and also the next half-cycle.

Notes:

• In Jain tradition, there are 24 Tirthankaras in each half-cycle. The identity of the first Tirthankar remains Rishabhanatha in both the present and the next cycle.
• Digambar and Śvetāmbar traditions may have slight variations in names or spellings, but the core figure is the same: Rishabhanatha (Adinath). You can read more about the 24 Tirthankaras here and here .