About “Kalpa Sūtra”
The Kalpa Sutra is a significant Jain scripture that includes the biographies of the Tirthankaras, especially Parshvanatha and Mahavira. It is attributed to Acharya Bhadrabahu, who is believed to have lived in the 4th century BCE. The text mentions that it was written down 980 or 993 years after the Nirvana of Mahavira, or 1230 years after the Nirvana of Parshvanatha. It is an ancient Jain text composed by Bhadrabahu. (Summary adapted from Wikipedia, CC BY-SA 4.0.)
Some summaries adapted from Wikipedia, CC BY-SA 4.0.