In Jainism, the ritual of "17 Besna" (सत्रह बेसना) is a traditional ceremony performed after the passing away (samadhi/moksha) of an Acharya, Upadhyaya, or other revered Jain monk/nun. This ceremony is typically observed on the 17th day after the soul’s departure.

The tradition of 17 Besna is not directly attributed to a specific Acharya Bhagwant (Acharya) as its originator in the canonical Jain scriptures. Instead, it has evolved as a customary practice within both the Shwetambar and Digambar Jain communities over centuries to honor the memory and teachings of departed spiritual leaders.

Therefore, there is no single Acharya Bhagwant who started the 17 Besna tradition; it is a part of Jain cultural practices rather than a ritual instituted by a particular Acharya. The main focus of the 17 Besna is to recall the virtues, teachings, and life of the departed saint and to offer collective prayers for spiritual upliftment.

If you are looking for more specific references or historical context regarding this practice within a particular Jain sect (Shwetambar, Digambar, Sthanakvasi, etc.), please specify, and I can provide more detailed information.