Ōta Dōkan

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Ōta Dōkan (太田道灌; 1432–1486), also known as Ōta Sukenaga, was a Japanese samurai lord, poet, and later a Buddhist monk. He became a monk in 1478 and took the name Dōkan.

He is best known for designing and building Edo Castle in the area of present-day Tokyo. Construction on the castle’s defenses began in 1457, and Dōkan added fortifications, walls, and moats. He also helped start a town around the fortress, which grew into Edo and eventually Tokyo. Dōkan is remembered as the founder of that castle town.

The Ōta clan came from Musashi Province and claimed descent from Minamoto no Yorimasa. They moved between lands in the Kantō region and served various rulers. Although born into the Ōta clan, Dōkan worked as a vassal for the Uesugi clan's Ogigayatsu branch.

Dōkan was known as a capable military strategist. He helped build fortifications at Kawagoe in 1457 and was noted for his knowledge of literature and poetry; some of his verses survive. He also selected the site for the Hikawa Shrine near Edo Castle, a shrine dedicated to learning and poetry.

In a period of clan intrigue, Dōkan was accused of disloyalty and died at the home of Uesugi Sadamasa in Sagami (now Kanagawa). After his death, Edo Castle would later become the home of Tokugawa Ieyasu and the center of the Tokugawa shogunate.

Today, Edo Castle is the Imperial Palace in Tokyo. Dōkan’s legacy is honored in modern Tokyo with celebrations of its founding and in regional festivals, such as Isehara’s summer Dōkan festival. He is also remembered for shaping the early city by redirecting the Hira River to create the Nihonbashi River and for his poetic contributions to Japanese literature.