Vedanta Desika (Swami Desikan, Swami Vedanta Desikan, Thoopul Nigamaantha Desikan) (1269–1370) was a Sri Vaishnava Guru. He was a poet, devotee, philosopher and master-teacher. He was the disciple of Swamy Sri Kidambi Appullar alias Sri Aathreya Ramanujachariar who comes in the lineage starting from Sri Ramanuja with Sri Thirukurugai Piran Pillan alias Sri Kurugesar,Sri Kidambi Aachan, Sri Aathreya Ramanujar, Sri Aathreya Rangarajachariar and many in the order. He is considered as an Avatar (incarnation) of the divine bell of Lord Venkateswara of Tirumalai by Sri Vaishavites.
Read more about Vedanta Desika: Birth, Early Life, Touring India, Works, Importance in Srivaishnava Tradition, Defence and Recovery of Srirangam, Salutation, Vazhi Thirunamam, Ascending The Divine Abode, Additional Reading, Works Online