The Sengoku era, also known as the "Warring States period," was a time of social upheaval and military conflict in Japan from the mid-15th century to the early 17th century. During this period, numerous feudal lords, or daimyōs, fought for power and territory, leading to a fragmented political landscape. The era is characterized by constant battles, shifting alliances, and the rise of powerful samurai. The Sengoku era ended with the unification of Japan under Tokugawa Ieyasu after the decisive Battle of Sekigahara in 1600. This led to the establishment of the Tokugawa shogunate, which brought about a long period of peace and stability known as the Edo period. The era significantly shaped Japanese culture, politics, and society.