The International Society for Krishna Consciousness was founded by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada in 1966. It belongs to the Gaudiya Vaisnava tradition, a devotional tradition based on the teachings of Bhagavad-gita and Srimad-Bhagavatam.
The precepts and practices of ISKCON were taught and codified by the 15th century saint and religious reformer Sri Caitanya Mahaprabhu and his principle associates, the Six Goswamis of Vrindavana.
Sri Caitanya, whom devotees revere as a direct incarnation of Krishna, gave a powerful impetus for a massive bhakti (devotional) movement throughout India. Under his direction hundreds of volumes on the philosophy of Krishna consciousness were compiled. Many devotees have followed in the line of Sri Caitanya Mahaprabhu including, in the 19th century, an outstanding Vaisnava theologian, Bhaktivinoda Thakura who brought Krishna consciousness to a modern audience.
Bhaktivinoda's son, Bhaktisiddhanta Sarasvati Goswami, became the guru of Srila Prabhupada and instructed him to spread Krishna consciousness in the West.