En un regard
Le château en bref
Ōi Castle (大井城, Ōi-jō) stood in the Ōi district of Ena, in Gifu Prefecture, on the site of the present-day Ōi municipal primary school. This hirayamajiro was traditionally said to have been founded in 1435 by Hara Hideyuki, a vassal of the Toki, military governors of Mino; the date is one handed down by tradition. Around 1473 it was occupied by forces of the Ogasawara of Shinano. Around 1534 it was retaken by the Tōyama of Iwamura, who placed their vassal Fujii Munetsune there. According to one secondary synthesis, it came under the sway of the Takeda in 1572–1573, under Akiyama Torashige, and was then reportedly retaken by the Oda in 1575, after Nagashino, and abandoned. The medieval structures have disappeared; only depressions interpreted as former dry moats are recorded. Preventive excavations preceded the school buildings, and their report was published in 1999. The school has occupied the site since 1909. It should not be confused with the separate site of Ōi-jō / Takauchidani-jō, in Ōimachi Jōku.