Oko Castle 岡豊城
Sannodan (Third Bailey)
Picture Donated by Raymond W.
Founder Chosokabe clan
Chosakabe
Year 13-14th Century
Type Mountaintop
Condition Ruins
Admin's Rating ★ ☆ ☆ ☆ ☆
Historical Site National Historic Site
Location Nangoku, Kochi Pref.
Map Google Map
Access Kochi Sta., 25 min bus
Website Kochi Prefectureal Museum of History
Notes The Kochi Prefectureal Museum of History is located on part of the former castle grounds.
History Founded sometime in the Kamakura Period, Oko Castle was the original base of power for the Chosokabe Clan. In 1509 Motoyama Motoshige captured the castle but after reaching an agreement with the Chosokabe it was returned in 1511. In 1585, Chosokabe Motochika unified Shikoku from Oko Castle. Later that same year Hideyoshi invaded Shikoku. Chosokabe surrendered to Hideyoshi and was allowed to keep his home domain of Tosa. The Chosokabe moved their home castle from Oko Castle to Otakasaka Castle, which was on the site of the current Kochi Castle in 1588, but due to poor conditions they soon moved back to Oko Castle. In 1591 they moved to their final castle Urado Castle and abandoned Oko Castle.
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Nangoku, Kochi Pref.
Oko Castle views
Sannodan (Third Bailey) Close Up of Sannodan stone walls
Main bailey Ninodan (Second Bailey)
Stair from Honmaru to Sannodan West Side Earthen embankment of the Ninodan
Horikiri between Ninodan and Sannodan Steep Northern Side of Ninodan
Sannodan (Third Bailey) embankment, West Side Baileys below Sannodan South Side
Shinodan (Fourth Bailey) Shinodan (fourth bailey) entrance
A View from Ninodan Looking East
Map A view of the hill where Oko Castle is located