Pir Sadardin was born in 700 A.H. in the village of Sabzwar in Persia. Pir Sadardin, who traces his descent from Imam Ja'far-as-Sadiq, came to India during the Imamat of Imam Qasim Shah and was given Piratan by Imam Islam Shah, our 30th Imam. Pir Sadardin, as the tradition maintains, had taken training in the field of preaching under Pir Shamsh Sabzwari and had accompanied him during his visit to Sindh, Punjab, and Kashmir. He gave the new converts the honorable title of 'Khawaja' and also established the very first Jamatkhana at Kotda, a village in Punjab. He has composed over 250 Ginans. Out of his several works and Ginans the most popular is Das Avatar`. This work was produced as an exhibit in the First Aga Khan Case in 1866 and was of tremendous help in falsifying the charges forged by the seceders who intended to prove that Pir Sadardin was a Sunni and that the Khojas were sunnis too.

Pir Sadardin had taken great pains for the propagation of Islam, and through it Ismailism, in India. In the Ginans that Pir Sadardin composed, he took the gist of the Holy Qur'an and explained it in our own language. He also prepared the Du'a for the Ismailis. He passed away in 770 A.H. at Uttch and was buried at Trinda Gorgej where his mausoleum still stands. He had five sons, of whom Hassan Kabiruddin was given Piratan by Imam Islam Shah.

Mowlana Sultan Muhammad Shah says in his Holy Farman about Pir Sadardin:

"You were Hindus; Pir Sadardin composed Ginans and explained to you about Ismailism from the Holy Qur'an."