Kalyansagarsuri (c. 1577 – 1661 CE) was a 16th century Jain ascetic, reformer, philosopher, and researcher belonging to the Achal Gaccha of the Śvetāmbara Murtipujaka sect of Jainism.

[1][2] Kodan Kumar was born to Naning (father) of Shrimali clan and Namilde (mother) on the 2nd day of the bright half of Ashadha month in 1577 CE in the town of Lolada in Patan, Gujarat.

[3][4][5] With permission from his parents, at the age of 9 years, he was initiated as a Jain monk on 4th day of the bright half of Falguna month in 1586 CE by Acharya Dharmamurtisuri of Achal Gaccha of the Śvetāmbara sect of Jainism in the town of Dholka, Gujarat and was renamed as Kalyansagar.

[2][3][5] After initiation, Kalyansagar began studying the Aagamas, law, poetry, grammar and other scholarly disciplines under his preceptor Dharmamurtisuri's guidance.

From Jamnagar port, the four-fold sangha began its journey towards Palitana with the vow of 6 Ri's as directed by Jain scriptures.

After paying their homage to the presiding deity Rishabhanatha, the brothers initiated the construction of a temple atop Mount Shatrunjaya on the 9th day of the bright half of Marghshirsh month in 1594 CE.

[8][9] In 1596 CE, a businessman named Raaysinh Nagda organized a pilgrimage to Palitana with the vow of 6 Ri's under the guidance of Kalyansgarsuri.

[7][10] His preceptor, Acharya Dharmamurtisuri, in his final days, went to Prabhaspatan, where he called demi-goddess Mahakali to solve his dilemma of who to appoint as his successor and to give them the powers of invisibility and flying.

He was appointed as the leader of Achal Gacch on 11th day of the dark half of the Paush month in 1611 CE in the town of Patan.

During the pilgrimage to Palitana, on one night, Kalyansagarsuri noticed some unusual behavior of birds indicating a risk to lives of Vardhman and Padamsinh.

While the brothers were walking barefoot with the Kalyansagarsuri, an elephant that accompanied the sangha became aggressive due to sexual desire and it became difficult to control him.

The pleased king then ordered a ban on animal slaughter in his kingdom during the 8 days of Paryushana and constructed a Jain temple out of respect for Kalyansagarsuri.

On the tenth day, Jahangir arrived at the temple where Kalyansagarsuri asked him to bow down to the Tirthankara idol if he wanted to witness the miracle.

[8][11][12] Kalyansagarsuri died at the age of 84 on the 13th day of the bright half of Ashwin month in 1661 CE during chaturmas in Bhuj, Kutch.