who is madara?

Before the era of ninja villages, Madara Uchiha was the leader of the Uchiha clan, the first person to awaken the Mangekyō Sharingan (and likewise its "eternal" form), a co-founder of Konohagakure, and a man able to tame even Kurama, the Nine-Tailed Demon Fox. Madara and Hashirama Senju, Konoha's First Hokage, eventually fought over leadership of Konoha at a site that would later be called the Valley of the End. History recorded that Madara was killed during the battle and the Nine-Tails taken from him.

Decades after, a masked-individual known only as "Tobi" surfaced. He later identified himself as Madara Uchiha. Tobi claims to have encouraged Yahiko to form Akatsuki as well as the one who "gave" the Rinnegan to Nagato.^[3] U