The Ota Dokan reference article from the English Wikipedia on 24-Apr-2004
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Ota Dokan

Time you got around to sponsoring a child
Ota Dokan (太田 道灌), 1432-1486, was born as Ota Sukenaga (太田 資長) into a daimyo family descending from Minamoto Yorimasa. In 1457 he built the castle of Edo and in 1458 he took the name Dokan, by which he is mainly known.