At Guru Hargobind's death, his grandson, Guru Har Rai, becomes guru. After his death, his very young son, Guru Har Krishan, becomes guru, but dies of smallpox. After which, Guru Hargobind's youngest son becomes guru. He is named eventually Guru Teg Bahadur, which means brave sword or brave wielder of the sword, because as his father, Guru Hargobind, fought the Mughals, he was known as being unusually brave and an unusually competent warrior. He continued this tradition of being a warrior saint, and especially under the rule of Shah Jahan and Aurangzeb, as the Mughals became more and more intolerant and started forced conversions. He viewed himself as a protector of the oppressed, not just of the Sikhs, but the oppressed of any faith, including Hindus, who were being forced to convert by Aurangzeb. Eventually, Aurangzeb tortures and kills him for refusing to convert to Islam, and he is considered the second guru who is martyred.