Lal Shahbaz Qalandar
Syed Muhammad Usman Marwandi (1149–1299), better-known as Lal Shahbaz Qalandar , was a Sufi poet from Afghanistan. He belonged to the Suhrawardi order of Sufis. He shifted from Afghanistan and went and settled in Sindh area of India (now in Pakistan). His shrine in Sehwan Sharif, Sindh,Pakistan, is still visited by many people. 
Syed Muhammad Usman Marwandiؒ
- Sarah Ansari (1971) Sufi Saints and Pirs of Sindh, 1843–1947. Lahore: Vanguard Books, 1971, p 87, 88, 89
- Ansari, 88-89
- I A Rashid, Note on Lal Shahbaz Qalandar. in Story of Pakistan. 6 March 2004.