 The Indian early medieval age, 600 CE to 1200 CE, is defined by regional kingdoms and cultural diversity.When Harsha of Kannauj, who ruled much of the Indo-Gangetic Plain from 606 to 647 CE, attempted to expand southwards, he was defeated by the Chalukya ruler of the Deccan.When his successor attempted to expand eastwards, he was defeated by the Pala king of Bengal.