The Chalukya dynasty ruled from the sixth to the eighth centuries CE, and the two prominent rulers were Pulakeshin II, who defeated the north Indian Emperor Harsha, and Vikramaditya II, who defeated the Arab invaders in the eighth century. The Rashtrakuta dynasty ruled Maharashtra from the eighth to the tenth century. The Arab traveller Sulaiman al Mahri described the ruler of the Rashtrakuta Dynasty Amoghavarsha as one of the four great kings of the world. Shilahara dynasty began as vassals of the Rashtrakuta dynasty which ruled the Deccan plateau between the eighth and tenth centuries. From the early 11th century to the 12th century, the Deccan Plateau, which includes a significant part of Maharashtra, was dominated by the Western Chalukya Empire and the Chola dynasty. Several battles were fought between the Western Chalukya empire and the Chola dynasty in the Deccan Plateau during the reigns of Raja Raja Chola I, Rajendra Chola I, Jayasimha II, Someshvara I, and Vikramaditya VI.