Japan Castle Atlas

Abe Tadaaki

阿部忠秋

An early Edo-period daimyo who served as a senior councilor (roju) under the third and fourth shoguns, Iemitsu and Ietsuna, and became lord of the Oshi domain in 1639.

Years: 1602–1675

Historical record

Story

From the time he became lord, Oshi Castle remained in the Abe family's hands for 185 years.

Connected castles

In-depth article

Gyōda, Saitama

Oshi Castle

忍城

A castle in the marshes that held out against Ishida Mitsunari's flooding siege and earned the name "Floating Castle"; the three-story turret standing there now was built in 1988, on a new spot, as part of a museum.

Next 100 Fine Castles No. 124CastleFlatland

Saigen JiroCC0Wikimedia Commons

first Abe-family lord of Oshi CastleRecord source: article

Sources

1
行田市郷土博物館・忍城御三階櫓のご案内(行田市郷土博物館)Checked: 2026-10-03
2
阿部忠秋(補助資料)(Wikipedia日本語版)Checked: 2026-10-03