Who is Uchiha Madara

Madara Uchiha (うちはマダラ, Uchiha Madara) was a legendary shinobi who led the Uchiha clan prior to, and after the formation of Konohagakure. After allying with his rival, Hashirama Senju and the Senju clan, he and his clan helped in the founding of Konoha.^[3] He eventually came to an impasse with Hashirama, and defected from the village. He was later seemingly killed by his rival at the battle at the Valley of the End, but in fact went into hiding to begin his decades-long plot, known as the Eye of the Moon Plan, which was continued by Obito Uchiha who later joined him. Madara was eventually reincarnated byKabuto Yakushi during the Fourth Shinobi World War, and becomes one of the main antagonists in the series.