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Bhai Mansukh (Punjabi: ਭਾਈ ਮਨਸੁੱਖ ) was a devout Sikh and a trader from Lahore region and was disciple of the Guru Nanak. He embraced Sikh faith in company of Bhai Bhagirath(Nambardar of Mailsihan, Shahkot, who Durga worshipper, converted to Sikh faith by Baba Nanak).
Mansukh preached Sikh thought around South India and Sri Lanka. Under influence of Mansukh King Shivnabh of Sangladeep accepted Sikh thought. He told Shivnabh about Guru Nanak being on religious travels and will visit Sri Lanka region.
References
Bhai Mansukh Wikipedia(Text) CC BY-SA