Sri Ramanujacharya Kovil - Srirangam Temple - Trichy-Tamil Nadu

Sri Ramanuja (1017--1137), also known as Sri Ramanujacharya, was a theologian, philosopher, and scriptural exegete. He is seen as the most important teacher (ācārya) of their tradition who followed Nathamuni and Yamunacharya, and by Hindus in general as the leading expounder of Viśiṣṭādvaita, one of the classical interpretations of the dominant Vedanta school of Hindu philosophy.
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Visishtadvaita philosophy
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Ramanuja's philosophy is referred to as Vishishtadvaita because it combines Advaita (oneness of God) with Vishesha (attributes).

Ramanuja may have written 9 books. They are also referred to as the nine precious gems, the Navarathnas.

His most famous work is known as the Sri Bhasya or Brahma Sutra Bhasya. It is a commentary on the Brahma Sutras, known also as the Vedānta Sūtras of Badarayana.

Gadhya Thrayam (three prose hymns). All three are important works in Srivaishnava philosophy:

Vaikunta Gadyam describing in great detail Vaikuntha, the realm of Vishnu and recommending meditating on it.

Sriranga Gadyam, a prayer of surrender to the feet of Ranganatha

Saranagati Gadyam, an imagined dialogue between Ramanuja and Shri (Lakshmi) and Narayana where he petitions Lakshmi to recommend Narayana to give him grace. Narayana and Lakshmi accept his surrender.

Vedartha Sangraha (a resume of Vedanta). It sets out Ramanuja's philosophy, which is theistic (it affirms a morally perfect, omniscient and omnipotent God) and realistic (it affirms the existence and reality of a plurality of qualities, persons and objects).

Vedanta Saara (essence of Vedanta) an appendix to Sri Bhasya

Vedanta Deepa (the light of Vedanta), another appendix/commentary to Sri Bhasya.

Gita Bhashya ( his commentary on the Bhagavad Gita)

Nithya Grantham (About the day to day activities to be performed by all Sri Vaishnavas)