Jisho

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公国
Wikipedia definition
1. Principality of AchaeaThe Principality of Achaea or of the Morea was one of the three vassal states of the Latin Empire which replaced the Byzantine Empire after the capture of Constantinople during the Fourth Crusade. It became a vassal of the Kingdom of Thessalonica, along with the Duchy of Athens, until Thessalonica was captured by Theodore, the despot of Epirus, in 1224.
Read “Principality of Achaea” on English Wikipedia
Read “アカイア公国” on Japanese Wikipedia
Read “Principality of Achaea” on DBpedia

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