The Akechi clan is a branch of the Toki clan, which is descended from the Seiwa Genji. The Akechi clan thrived around the later part of the Sengoku period of the 16th century. The Akechi became the head, soryo of the Toki after the Toki fell to the Saitō clan in 1540. The Akechi denied to be under Saito Yoshitatsu who attacked the Nagayama castle. Akechi Mitsuhide then served shoguns Ashikaga Yoshiteru and Ashikaga Yoshiaki. After introducing Ashikaga Yoshiaki to Oda Nobunaga, Mitsuhide became a powerful general under Oda Nobunaga. However, after 1582, Mitsuhide trapped Nobunaga at Honnō-ji and forced him to commit suicide. The Akechi then gained power due to the collapse of the Oda clan. Later that same year, Akechi Mitsuhide was slain at the Battle of Yamazaki, twelve days after the Incident at Honnō-ji. The Akechi clan then fell from prominence.