Koizumi Castle, Medieval castle in Oizumi, Japan
The fortification includes multiple moats, earthen ramparts, and defensive walls constructed on a 33-meter-high plateau in a flat region of Gunma Prefecture.
Built in 1489 by Tomimochi, son of Yuki Mochitomo, the castle changed hands between several feudal lords before falling to Toyotomi Hideyoshi's forces in 1590.
The castle grounds contain relocated ancient burial mounds from the Kofun period, designated as important cultural properties by the Oizumi municipal government.
The castle site, now transformed into Shironouchi Park, maintains its original inner and outer moats with concrete-reinforced embankments.
Between the inner and outer moats stand multiple oval stone pillars inscribed with 'Koshin', indicating Edo period religious practices at the site.
Location: Oizumi
Inception: 1489
GPS coordinates: 36.26139,139.41400
Latest update: March 15, 2025 05:01
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