Rāmānuja, was a disciple of Śrī Yāmunācarya. Śrī Yāmuna, composer of texts such as the Gītārtha Saṃgraha, Siddhi Traya and Stotra Ratna, was the grandson of the 9th century sage Śrī Nāthamuni and a forebear of T Krishnamacharya.

Krishnamacharya’s personal devotional philosophy and practices were grounded in the teachings that arose from these great sages and evolved into what became known as Viśiṣṭādvaita or qualified non-dualism (One of the three primary schools of Vedānta).

“Rāmānuja agrees with the Advaitin that the scripture
teaches the non-twoness (Advaita) of reality.
But, he denies the Advaitan’s conclusion
that this oneness is attributeless,
pure being or consciousness and that plurality
with regard to soul and material world is falsely
imposed on this one Being due to ignorance.”
Rāmānuja on the Yoga – Dr. Robert C Lester 1976.