The goal of national unification and a return to the comparative political stability of the earlier Muromachi period was widely shared by the multitude of autonomous "daimyōs" during the Sengoku period. Oda Nobunaga was the first for whom this goal seemed attainable. Nobunaga had gained control over most of Honshu (see map below) before his death during the 1582 Honnō-ji incident, a coup attempt executed by Nobunaga's vassal, Akechi Mitsuhide. Nobunaga was betrayed by his own retainers who set the Honno-Ji temple on fire; then, instead of burning in flames, Oda Nobunaga had committed seppuku to escape the flames. The motivation behind Mitsuhide's betrayal was never revealed to anyone who survived the incident, and has been a subject of debate and conjecture ever since the incident.