He was a Pathan. Later his Vaishnava name was Chaitanya dasa. He was a disciple of Shyamananda prabhu. A political representative of the Muslim Emperor, Ser Khan was possibly the ruler of Ambua Dharenda Pargana in Orissa.
Prema vilasa 19 writes as follows: One day Shyamananda prabhu was passing with his followers singing kirtana. At that time Ser Khan arrived there and ordered Shyamananda to stop singing. When Shyamananda refused to comply, Ser Khan crushed their mrdanga and began harassing them. Shyamananda could not tolerate seeing his Devotees harassed and burst into a loud roar, which made Ser Khan severely ill and he vomited blood. Out of fear, Ser Khan and his followers humbly surrendered at the feet of Shyamananda. All of them took spiritual initiation from Shyamananda and became ardent Vaishnavas. 
One day Shyamananda prabhu was passing with his followers singing kirtana. At that time Ser Khan arrived there and ordered Shyamananda to stop singing. When Shyamananda refused to comply, Ser Khan crushed their mrdanga and began harassing them. Shyamananda could not tolerate seeing his Devotees harassed and burst into a loud roar, which made Ser Khan severely ill and he vomited blood. Out of fear, Ser Khan and his followers humbly surrendered at the feet of Shyamananda. All of them took spiritual initiation from Shyamananda and became ardent Vaishnavas. (In the wallpaper: A Devotee, mridanga, Shyamananda Prabhu).