Guru Nanak Dev Ji promulgated a unique and universal philosophy of humanism in the Indian sub-continent as the renaissance was taking place in Europe (14th to 16th centuries) and scientists were challenging religious concepts and beliefs.
Guru Nanak carried his message far and wide to South Asia and the Middle East. He held discussions with religious leaders: Hindus—(Brahmans, Sidhs and Jogis), Muslims—(Sufis, mullahs and Qazis), Jains and Buddhists in India, the Middle East, Tibet and Ceylon (Sri Lanka).
During his travels (odysseys, Udasis) Guru Nanak challenged the ancient mythology, religious concepts and rituals with which the peoples of South Asia and Middle East.
There are evidences that affirm travel of Guru Nanak Dev Ji from Mecca to Israel, Palestine, Syria, and Turkey and then to Baghdad.