Guru Arjan Dev oversaw the building of Harmandir Sahib (Golden Temple).
He also compiled The Adi Granth which included the teachings of first five Gurus & that of many Hindu & Muslim Saints. It graced the Harmandir Sahib for the very first time in 1604.
He sacrificed his life for upholding human rights & freedom of worship.
Guru Har Rai gave lectures on the writings of the Gurus. He ate simple food which was earned by the labour of his own hands.
Followers from far would come to Kiratpur to seek the blessings of Guru Har Rai. The Guru spread the message of Sikhism through sending out disciples to eastern India, to Rajasthan and to Delhi.