The medieval era can be broadly divided into several periods: The earliest native kingdoms and imperialism; the successful domination of the Gangetic plains in northern India and rivalry with the empires of Tamilakam over the Vengi region; and the domination of the southern Deccan and consolidation against Muslim invasion. The origins of the rise of the Karnataka region as an independent power date back to the fourth-century birth of the Kadamba Dynasty of Banavasi, the earliest of the native rulers to conduct administration in the native language of Kannada in addition to the official Sanskrit. This is the historical starting point in studying the development of the region as an enduring geopolitical entity and of Kannada as an important regional language.