Yamunacharya

Yamunacharya (IAST: Yamunāchārya), also known as Alavandar and Yamunaithuraivan, was a Vishistadvaita philosopher based in Srirangam, Tamil Nadu, India. He is best-known for being a preceptor of Ramanuja, one of the leaders of the Sri Vaishnava tradition. He was born in the early 10th century CE, and was the grandson of Nathamuni, a famed yogi, who collected the works of the Tamil Alvars. Provided by Wikipedia