Nandivardhana was a Kshatriya from the Ikshvaku dynasty and the chief of the Nāya Republic in Kundagrama, a suburb of Vaishali (Basarh in modern-day Bihar).
[1][2] He was the elder brother of Mahavira, the 24th Jain Tirthankara.
His father was Siddhartha.
[3].According to the second chapter of the Śvētāmbara Ācārāṅga Sūtra, Siddhartha and his family were devotees of Parshvanatha.
[4][5]