The last Buddhist king who was a great Sanskrit scholar and a writer was

Harsha (c. 590–647 CE), also known as Harshavardhana, was an Indian emperor who ruled North India from 606 to 647 CE. He was a member of the Vardhana dynasty; and was the son of Prabhakarvardhana who defeated the Alchon Huna invaders, and the younger brother of Rajyavardhana, a king of Thanesar, present-day Haryana. The last Buddhist king who was a great Sanskrit scholar and a writer was Harshavardhana.