Guru Har Krishan was the eighth of the tenSikh Gurus. At the age of 5, he became the youngest Guru in Sikhism on 7 October 1661, succeeding his father, Guru Har Rai Ji. He contracted smallpox in 1664 and died before reaching his 8th birthday but he was said to have died because he contracted smallpox from his followers in an attempt to cure them and he succeeded. It is also said that he died because he contracted small pox while successfully curing the disease of his followers. He is also known as Bal Guru, and sometimes spelled in Sikh literature as Hari Krishan Sahib. He is remembered in the Sikh tradition for saying "Baba Bakale" before he died, which Sikhs interpreted to identify his granduncle Guru Tegh Bahadur Ji as the next successor. Guru Har Krishan Sahib Ji had the shortest reign as Guru, lasting only 2 years, 5 months and 24 days.
Biography
Shri Guru Har Krishan was born in Kiratpur in northwest Indian subcontinent to Krishen Devi and Guru Har Rai. His father, Guru Har Rai supported the moderate Sufi influenced Dara Shikoh instead of conservative Sunni influenced Aurangzeb as the two brothers entered into a war of succession to the Mughal Empire throne. After Aurangzeb won the succession war in 1658, he summoned Guru Har Rai in 1660 to explain his support for the executed Dara Shikoh. Guru Har Rai sent his elder son Baba Ram Rai to represent him. Aurangzeb kept the 13 year old Ram Rai as hostage, questioned Ram Rai about a verse in the Adi Granth – the holy text of Sikhs. Aurangzeb claimed that it disparaged the Muslims. Ram Rai changed the verse to appease Aurangzeb instead of standing by the Sikh scripture, an act for which Guru Har Rai excommunicated his elder son, and nominated the younger Har Krishan to succeed as the next Guru of Sikhism. Aurangzeb meanwhile rewarded Ram Rai, patronizing him with land grants in Dehra Dun region of the Himalayas. A few years after Guru Har Krishan assumed the role of Sikh leader, Aurangzeb summoned the young Guru to his court, with an apparent plan to replace him with his elder brother Ram Rai as the Sikh Guru. However, Har Krishan contracted smallpox when he arrived in Delhi and his meeting with Aurangzeb was cancelled. On his deathbed, Har Krishan said, "Baba Bakale", and died in 1664. The Sikh religious organization interpreted those words to mean that the next Guru is to be found in Bakale village, which they identified as Guru Tegh Bahadur, the ninth Guru of Sikhism. Authentic literature with more details about Guru Har Krishan's life and times are scarce and not well recorded. Some of biographies about Guru Har Krishan, particularly about who his mother was, were written in the 18th century such as by Kesar Singh Chhibber, as well as in the 19th century, and these are highly inconsistent.