Baba Guru Nanak
Speaking of which...
Here is a lecture on Masnavi-e-moulana Room.
Oh Ab samjha aya "bawa" guru Nanak. Jalundri mahajroon nay apnay aaqa ki yaad mein naam rakha hai. :D
Jokes aside I heard Guru Namak is revered by some Muslims as Sufi saint. Is that true?
BAba ji almost became muslim. He almost arrived in makka madina.