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territory (pre-Taika: under the Yamato court; Heian: under a provincial governor, etc.)
「県」 has another reading with different meanings.
歴史の授業で古代の県の制度を調べた。
I studied the ancient county system.
古代日本では県を治める官吏がいました。
There were officials governing counties.
各県から大勢の人が集まった。
People gathered from each county.