the connection between the several Rashtrakuta dynasties that ruled small kingdoms in northern and central India and the Deccan between the 6th and 7th centuries. The relationship of these medieval Rashtrakutas to the most famous later dynasty, the Rashtrakutas of Manyakheta (present-day Malkhed in the Kalaburagi district, Karnataka state), who ruled between the 8th and 10th centuries has also been debated. The sources for Rashtrakuta history include medieval inscriptions, ancient literature in the Pali language, contemporaneous literature in Sanskrit and Kannada and the notes of the Arab travellers. Theories about the dynastic lineage (Surya Vamsa—Solar line and Chandra Vamsa—Lunar line), the native region and the ancestral home have been proposed, based on information gleaned from inscriptions, royal emblems, the ancient clan names such as "Rashtrika", epithets (Ratta, Rashtrakuta, Lattalura Puravaradhiswara), the names of princes and princesses of the dynasty, and clues from relics such as coins. Scholars debate over which ethnic/linguistic groups can claim the early Rashtrakutas. Possibilities include the Kannadiga, Reddi, the Maratha, the tribes from the Punjab region, or other north western ethnic groups of India. Scholars however concur that the rulers of the imperial dynasty in the 8th to 10th century made the Kannada language as important as Sanskrit. Rashtrakuta inscriptions use both Kannada and Sanskrit (historians Sheldon Pollock and Jan Houben claim they are mostly in Kannada), and the rulers encouraged literature in both languages. The earliest existing Kannada literary writings are credited to their court poets and royalty. Though these Rashtrakutas were Kannadigas, they were conversant in a northern Deccan language as well. The heart of the Rashtrakuta empire included nearly all of Karnataka, Maharashtra and parts of Andhra Pradesh, an area which the Rashtrakutas ruled for over two centuries. The Samangadh copper plate grant (753) confirms that the feudatory King Dantidurga, who probably ruled from Achalapura in Berar (modern Elichpur in Maharashtra), defeated the great Karnatic army (referring to the army of the Badami Chalukyas) of Kirtivarman II of Badami in 753 and took control of the northern regions of the Chalukya empire. He then helped his father-in-law, Pallava King Nandivarman regain Kanchi from the Chalukyas and defeated the Gurjaras of Malwa, and the rulers of Kalinga, Kosala and Srisailam. Dantidurga's successor Krishna I brought major portions of present-day Karnataka and Konkan under his control. During the rule of Dhruva Dharavarsha who took control in 780, the kingdom expanded into an empire that encompassed