Jayadeva (c. 1000 CE) was an Indian mathematician, who further developed the cyclic method (Chakravala method)[1] that was called by Hermann Hankel "the finest thing achieved in the theory of numbers before Lagrange (18th century)".[2] He also made significant contributions to combinatorics.[3]
Jayadeva's works are lost, and he is known only from a 20-verse quotation in Udaya-divakara Sundari (c. 1073), a commentary on Bhaskara I's Laghu-bhaskariya. This means that Jayadeva must have lived sometime before 1073,[4] possibly around 1000 CE.[1]