Religion of a warlike sect of India, originating in the Punjab and centered in the holy city of Amritsar. Nanak, a Hindu of the Kshasttya caste founded this sect, d.1500. The name Sikh signifies disciple, and the strict observants were called Khalsa. The reigious system, a revolt from polytheism, ceremonialism, and caste-exclusiveness, took for its chief doctrines the oneness of God, salvation by faith and good works, and the equality and brotherhood of man. Continual persecutions reduced the power of the Sikhs, but they maintained their religious distinctiveness. Their sacred books, called the , are preserved and venerated at Amritsar.