Answer

You may be referring to Acharya Kalakacharya. In the Jain tradition, his sister Sarasvati, who was a sadhvi, was abducted by King Gardabhilla of Ujjain. Kalakacharya then went to the Saka kings, gathered their support, defeated Gardabhilla, and rescued his sister. This story is known as Kālakācārya Kathā and is an important Śvetāmbara Jain legend. ( jainworld.jainworld.com)

Explanation

The story is usually told like this: Kalakacharya’s sister Sarasvati had renounced the world and become a nun. When King Gardabhilla took her away, Kalakacharya did not use violence himself, but sought help from the Saka rulers. With their army, he overthrew the king and brought Sarasvati back to her nunhood. Some Jain sources describe this as a great act of protection and dharmic courage. ( jainworld.jainworld.com)

This legend is often connected with the Kalpa-sutra tradition and is one of the best-known Jain historical stories about a monk protecting his sadhvi sister. ( openn.library.upenn.edu)

Spiritual Understanding

From a Jain view, this story shows:

• Loyalty to the sangh
• Respect for a renunciant woman
• Courage in protecting dharma
• Using intelligence rather than personal anger ( jainworld.jainworld.com)

Takeaway

If you meant the Jain story of an acharya who fought to save his sadhvi sister, it is Acharya Kalakacharya and Sadhvi Sarasvati. It is a powerful story of dharma, protection, and inner strength. ( jainworld.jainworld.com)