Ramanuja, also known as Rāmānujācārya, was an Indian Hindu philosopher, guru and social reformer. He is one of the most important exponents of the Sri Vaishnavism tradition in Hinduism. His philosophical foundations for devotional practice were influential in the Bhakti movement. c. 1000 – c. 1100; died at about 100. Alive at the same time as Omar Khayyám, Saladin, Averroes, Zhu Xi, and William the Conqueror. Wiki link