Date Masamune (?? ??, September 5, 1567 – June 27, 1636) was a regional ruler of Japan's Azuchi–Momoyama period through early Edo period.
Heir to a long line of powerful daimyo in the Tohoku region, he went on to found the modern-day city of Sendai.
An outstanding tactician, he was made all the more iconic for his missing eye, as Masamune was often called dokuganryu (???), or the "One-Eyed Dragon of Oshu".As a legendary warrior and leader, Masamune is a character in a number of Japanese period dramas.
He was played by Ken Watanabe in the popular 1987 NHK series Dokuganryu Masamune.