Ōta Dōkan

, also known as Ōta Sukenaga (太田 資長), was a Japanese samurai lord, poet and Buddhist monk. He took the tonsure as a Buddhist priest in 1478, and he also adopted the Buddhist name, Dōkan, by which he is known today. Dōkan is best known as the architect and builder of Edo Castle (now the Imperial Palace) in what is today modern Tokyo; and he is considered the founder of the castle town which grew up around that Ōnin era fortress.

Ōta clan genealogy The Ōta clan originated in 15th-century Musashi Province. They claimed descent from Minamoto no Yorimasa, and through that branch of the Minamoto they claimed kinship with the Seiwa-Genji.

The feudal progenitor of the clan name, Ōta Sukekuni, established himself at Ōta in Tanba Province, and he adopted this location name as his own. He traced his lineage as a fifth-generation descendant of Yorimasa. in Tōtōmi. Work on the defensive walls and moats began in 1457; and he took the name Dōkan the following year.

Ōgigayatsu Uesugi Mochitomo ordered Ōta Michizane and Dōkan to construct fortifications at Kawagoe in 1457.

As a military strategist, he is reputed to have been an effective tactician; but political intrigues can be as deadly as any battle. Despite years of distinguished service, the Uesugi clan leader proved fickle. Dōkan met an untimely end at 's home in Sagami (modern-day Kanagawa) after he was falsely accused of disloyalty during a period when the Uesugi family struggled through an internal clan conflict.

Dōkan was also well-read in classical (Heian period) literature; and like other samurai of his time, Dōkan was said to have been a skilled poet, but only fragments attributed to him have survived.

Dōkan is also credited with having selected the site of the Hikawa Shrine, which is dedicated to Sugawara no Michizane, the kami of poetry and scholarship. Hikawa Shrine is located very near Edo Castle.

Legacy Contemporary panoramic view of the Imperial Palace which today occupies the location which Ōta Dōkan selected and fortified in 1457. The Tokyo sky and skyline are much changed, but part of Dōkan's moat is preserved as a notable element of the site's past and present. Dōkan's residence in Kamakura became Eishō-ji, a Buddhist temple. The temple complex was founded by Okaji, a daughter of Ōta Yasusuke who would have been one of Dōkan's great-great-grandsons. Okaji was one of Tokugawa Ieyasu's attendants, and she later became a foster mother to Tokugawa Yorifusa (1603–61), the founder of the Mito branch of the Tokugawa family. After Ieyasu's death, Okatsu became a nun, taking the name Eishoin. The third shōgun, Tokugawa Iemitsu (1604–51), granted her the property her ancestors had once owned. In 1636, Eishoin had a temple built and she invited a daughter of Yorifusa to join her. Eisho-ji's prosperity helped preserve the memory of the 15th century ancestor who once lived in the same place.

In the late 16th century, Dōkan's Edo Castle was chosen as the new home of Tokugawa Ieyasu, who had been persuaded by Toyotomi Hideyoshi to transfer the seat of his clan holdings into the Kantō. With the establishment of the Tokugawa shogunate in the early 17th century, Edo Castle became the center of the shogunate government. When the shogunate was displaced in the Meiji Restoration in the late 19th century, the newly named Tokyo became an Imperial capital with an Imperial Palace rising from the former shōgun's stronghold. Every October 1, modern Tokyo celebrates the anniversary of its founding, which becomes a festival in honor of the memory of the samurai who would become honored as the founder of a great city.

The city of Isehara celebrates Dōkan's contributions to the area with the annual Dōkan festival each summer.

Dōkan's 15th century poetic description of what was once just a fortified hill on the Sumida River near Edo Bay would become the basis for metropolitan Tokyo Governor Ryokichi Minobe's 1971 re-election slogan: "Give Tokyo back its blue sky!"

The abode of mine Adjoins a pine grove Sitting on the blue sea And from its humble eaves Commands a view of soaring Fuji.

Instead of stone walls, the defense works around the 15th-century castle were only grassy embankments, and the structures inside them were not grand. The initial enclosure which served as the castle's core area, the space which would have been Dōkan's hon-maru, was modestly sized; but the moats were extensive for that time period. These moats and their locations would figure prominently in the serial phases of construction and development which followed.

Dōkan is also credited with diverting the Hira River east at Kandabashi to create the Nihonbashi River.