Located in Osaka City, Osaka Prefecture, Osaka Castle was built by Toyotomi Hideyoshi on the former site of the Ikkou Sect's Ishiyama Hongan Temple. He completed it in 1598 after 5 years of construction.
Glossary: Osaka-jou
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Osaka-jou (大坂城/大阪城)
Referenced from: Mirage: Saiai no Anata e, Mirage 9, Mirage 16
Bibilo: Osaka castle (english)