Jahangir ordered the execution of Guru Arjan Dev (not 'Singh') in 1606, making him the first Sikh martyr. The Guru was arrested for refusing to remove a verse from the Guru Granth Sahib that Jahangir found objectionable and for allegedly supporting Prince Khusrau's rebellion against Jahangir. He was tortured and made to sit on a hot iron plate, marking the beginning of Mughal-Sikh conflicts.