The Ramacharita, an example of dvyasrya-kavya, telling two stories simultaneously, was written by

The Ramacharita (or Ramacharitam) is a notable example of dvyasrya-kavya, a literary form characterized by a double narrative that tells two stories simultaneously through the use of slesha (double entendre). This specific work was written by Sandhyakara Nandi, a court poet of the Pala Empire. The poem is unique because it simultaneously narrates the mythological story of the Ramayana (the life of Lord Rama) and the historical events of the Varendra rebellion during the reign of the Pala King Rampala. While other authors like Bhatti wrote the Bhattikavya (also known as Ravanavadha) which serves a dual purpose of storytelling and grammar, the specific dvyasrya-kavya titled Ramacharita that chronicles King Rampala is attributed to Sandhyakara. Kamban is famous for the Tamil Ramavataram, and Subandhu is known for Vasavadatta.

Sources

1. [1] https://en.wikipedia.org/wiki/Ramacharitam