Izuna Uchiha

Izuna Uchiha was the brother of Madara Uchiha, together, they were the first to awaken the Mangekyo Sharingan, and because of that were the leaders of the clan during their time. When his brother Madara, became blind due to his Mangekyo Sharingan, Izuna willingly gave up his eyes to his brother, but in turn died.