Question of the day #302, Books & Authors

"X" is a 2400 page 20th century novel written by "Y" in 5 volumes. The novel is about a renowned king of South India during 10th and 11th centuries. "Y" is an awardee of Sahitya Akademi Award which he received posthumously. "Y" also received Sangeetha Kalasikhamani Award in 1953. What is "X"?