International Society for Krishna Consciousness (ISKCON) was founded by His Divine Grace A.C. Bhaktivedanta Swami (Srila Prabhupada) in the West in 1966. ISKCON belongs to Gaudiya (refers to Bengal) Vaishnavism, 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 (1486-1532), his brother Nityananda Prabhu and six of his principle associates, the Goswamis of Vrindavana (Sanatana, Rupa, Jiva, Gopal Bhatta, Raghunatha Dasa and Raghunatha Bhatta.)
The Bhagavad-gita was first put into writing about 5000 years ago. The Gita is the principal scripture of The Hare Krishna Movement™ Organization. Its origins are more than 5000-years-old.