Guru Har Krishan ( ; 23 July 1656 – 30 March 1664) was the eighth of the ten gurus of Sikhism. He became Guru on 7 October 1661, on the death of his father, Guru Har Rai. Due to the smallpox epidemic that was happening at that time, Guru Har Krishan died at the young age of 7. His grand-uncle, Guru Tegh Bahadur, became the next Guru of the Sikhs.