'Sunder Mundariye, hoye!'- a line from the most popular Lohri song, is definitely not unknown to any one even remotely associated with Punjab. Sung in the praise of Dulla Bhatti- a dacoit from Punjab- this song speaks about how he robbed the rich to help the poor.
Dulla Bhatti's real name was Rai Abdullah Khaan Bhatti. He was a famous legendary Rajput hero of Punjab, who led a rebellion against the Mughal emperor, Akbar. Besides robbing the rich, he rescued Sikh and Hindu girls being forcibly taken to be sold in slave market of the Middle East. He arranged their marriages to Sikh and Hindu boys with rituals and provided them with dowries. So, every other Lohri song has words to express gratitude to Dulla Bhatti.
Dulla Bhatti was a rebel whose lineage was of Bhatti Rajputs converted to Islam often by force. His anscestors were the rulers of Pindi Bhattian in Sandal Bar area of present day Pakistan.
There is a kind of epic in Punjabi language called Dulle da var, which narrates the battle events of Dulla Bhatti. Even today, there's a region in Punjab, Pakistan, called 'Dulle Di Bar' means the forest of Dulla Bhatti.