Kammu was a Japanese emperor who reigned from 781 to 806 AD. He is known for moving the capital from Nara to Kyoto, which became the center of Japanese culture and politics for centuries. His reign marked the beginning of the Heian period, a time characterized by significant developments in art, literature, and governance. During Kammu's rule, he focused on consolidating power and reducing the influence of powerful Buddhist temples. He implemented various reforms to strengthen the imperial court and improve administration. Kammu's efforts laid the groundwork for the flourishing of Heian culture and the establishment of a more centralized government in Japan.