There is a popular story connecting Srirangam Ranganatha Swamy with a Muslim princess. There is a sub-shrine dedicated to Thuluka Nachiyar or Thuglaq princess in the Srirangam Ranganatha Swamy temple in Tamil Nadu.
In 1311 CE, Malik Kafur, the commander of Alauddin Khilji, attacked Srirangam Ranganatha Swamy temple in Tamil Nadu and carried away the golden utsavar murti or the processional murti of Bhagavan Ranganatha. Surathani daughter of Malik Kafur fell in love the murti of Ranganatha Swamy and asked for it to be given to her.
The young princess bathed, dressed and fed the murti with love.
A group of attendants from Srirangam was following the murti without the knowledge of the soldiers of Malik Kafur. They disguised as minstrels and entered the court of Malik Kafur. They pleased Malik Kafur with their dances and songs. The commander offered them anything they wanted as reward.
They asked for the murti of Ranganatha Swamy to be given to them. But Surathani would not part with the murti. Bhagavan then put her to deep sleep and the group obtained the murti and took it back to Srirangam. They felt the murti would not be safe in Srirangam so they kept it at Tirumala Tirupati.
When Surathani woke up she realized the murti was missing and she forced her father to take her to Srirangam. But when she reached Srirangam she was unable to locate the murti and collapsed in the temple and died.
Few years later when the murti was brought back to the temple, Ranganatha Swamy appeared in the dream of the chief priest and instructed Surathani be given a space in the temple.
A shrine was prepared for her near the Arjuna Mandapam with a painting of Surathani as Thuluka Nachiyar.
In honor of the Muslim princess, the first food offering made to Ranganatha Swamy in the morning is Roti with butter.