In the context of Jainism, "1657 sangh" refers to a historical Jain pilgrimage (yatra) or congregation that took place in the year V.S. 1657 (Vikram Samvat), which corresponds to 1600 CE. During this time, a prominent sangh (religious group or pilgrimage) visited the sacred site of Shikharji (also known as Sammed Shikharji), one of the holiest tirthas (pilgrimage sites) in Jainism.

This sangh was led by Kalyanji, also known as Kalyanji Bhattarak. He was a respected Jain leader and organizer of pilgrimages. The detailed events and the names of participants are often found inscribed at the Shikharji tirtha and recorded in Jain historical texts.

So, the 1657 sangh was under the leadership of Kalyanji.