Kalpasutra, a text containing the biographies of the Jain Tirthankaras, was written by Bhadrabahu. Bhadrabahu was a revered Jain ascetic and scholar who played a significant role in the history of Jainism.

Kalpasutra:
Kalpasutra is one of the most important texts in Jain literature. It is a sacred Jain scripture that primarily focuses on the lives and teachings of the Jain Tirthankaras, who are considered enlightened beings and spiritual leaders in Jainism. The text also provides information about the monastic rules and rituals followed by Jain monks and nuns.

Author - Bhadrabahu:
Bhadrabahu was a prominent Jain scholar and spiritual leader who lived during the 4th century BCE. He was a contemporary of Chandragupta Maurya, the founder of the Mauryan Empire. Bhadrabahu was the last Shrutakevali (one who has complete knowledge of the Jain scriptures) of the Digambara sect of Jainism.

Significance of Bhadrabahu:
Bhadrabahu is known for his contributions to the development and preservation of Jainism. He is credited with compiling several important Jain texts, including the Kalpasutra. Bhadrabahu's teachings and writings have had a profound influence on Jain philosophy and principles.

Bhadrabahu and Chandragupta Maurya:
Bhadrabahu played a crucial role in the life of Chandragupta Maurya. As per historical accounts, Bhadrabahu foresaw a twelve-year famine and advised Chandragupta Maurya to move to the Deccan region to escape the scarcity of resources. Following his advice, Chandragupta Maurya, accompanied by Bhadrabahu and a group of Jain monks, migrated to the Deccan. It is believed that Bhadrabahu's knowledge and guidance helped Chandragupta Maurya establish his empire successfully.

Conclusion:
In conclusion, the Kalpasutra, a text containing the biographies of the Jain Tirthankaras, was written by Bhadrabahu. Bhadrabahu was a significant figure in Jainism, known for his contributions to Jain literature and his association with Chandragupta Maurya. His teachings and writings continue to be revered by followers of Jainism.