Jōgan

Also known as Zhenguan

Zhenguan may refer to:

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Historical eras

Zhenguan may refer to: Zhenguan (斟灌), an ancient Chinese state during the Xia dynasty before 2010 BC, located in approximately modern Shouguang, Shandong

==Historical eras== Zhenguan (貞觀, 627–649), era name used by Emperor Taizong of Tang Zhenguan (貞觀, 1101–1113), era name used by Emperor Chongzong of Western Xia