Who is the first Indian mathematician to contribute to the theory of relativity?

The first Indian mathematician to contribute to the theory of relativity is Srinivasa Ramanujan. Although primarily known for his work in number theory and mathematical analysis, his insights and innovative approaches provided a foundation that influenced various fields, including theoretical physics. His collaboration with mathematicians like G.H. Hardy helped bridge his work with modern scientific theories, including relativity. Ramanujan's contributions have had a lasting impact on mathematics and physics.