Who is Dulla Bhatti, Punjab's Robinhood immortalised in Lohri song

The story of Dulla Bhatti can be traced to the 16th-century in a small village called Pindi Bhattian, nestled in the forests of west Punjab. In July 1547, months after Farid's execution, his wife gave birth to their only son, Abdullah, whom the villagers affectionately called 'Dulla'.