known as the Ādi Granth (literally "the first book") and included the writings of the first five Gurus and other enlightened 13 Hindu and 2 Muslim Sufi saints. In 1606, he was tortured and killed by the Mughal emperor Jahangir, for refusing to convert to Islam. His martyrdom is considered a watershed event in the history of Sikhism. Political advancement After the martyrdom of Guru Arjan, his son Guru Hargobind at age eleven became the sixth Guru of the Sikhs, and Sikhism dramatically evolved to become a political movement in addition to being religious. Guru Hargobind carried two swords, calling one spiritual and the other for temporal purpose (known as mīrī and pīrī in Sikhism). According to the Sikh tradition, Guru Arjan asked his son Hargobind to start a military tradition to protect the Sikh people and always keep himself surrounded by armed Sikhs. The building of an armed Sikh militia began with Guru Hargobind. Guru Hargobind was soon arrested by the Mughals and kept in jail in Gwalior. It is unclear how many years he served in prison, with different texts stating it to be between 2 and 12. He married three women, built a fort to defend Ramdaspur and created a formal court called Akal Takht, now the highest Khalsa Sikh religious authority. In 1644, Guru Hargobind named his grandson Har Rai as the Guru. The Mughal Emperor Shah Jahan attempted political means to undermine the Sikh tradition, by dividing and influencing the succession. The Mughal ruler gave land grants to Dhir Mal, a grandson of Guru Hargobind living in Kartarpur, and attempted to encourage Sikhs to recognise Dhir Mal as the rightful successor to Guru Hargobind. Dhir Mal issued statements in favour of the Mughal state, and critical of his grandfather Guru Arjan. Guru Hargobind rejected Dhir Mal, the latter refused to give up the original version of the Adi Granth he had, and the Sikh community was divided. Guru Har Rai is famed to have met Dara Shikoh during a time Dara Shikoh and his younger brother Aurangzeb were in a bitter succession fight. Aurangzeb summoned Guru Har Rai, who refused to go and sent his elder son Ram Rai instead. The emperor found a verse in the Sikh scripture insulting to Muslims, and Ram Rai agreed it was a mistake then changed it. Ram Rai thus pleased Aurangzeb, but displeased Guru Har Rai who excommunicated