Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Bhai Mati Das is one of the greatest martyrs in Sikh history. He along with his younger brother Bhai Sati Das and Bhai Dyal Das, all disciples of the ninth Sikh Guru, Guru Teg Bahadur, were executed along with him at the Kotwali(police-station) near the Sunehri Masjid in the Chandni Chowk area of Old Delhi, under the express orders of emperor Aurangzeb.