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Books about Yunyuan:
Zang Yunyuan shi xuan (Mandarin Chinese Edition) by Yunyuan Zang (1987)
Wiki information Yunyuan:
Zhou Yunyuan, courtesy name Ruliang, was an official of Wu Zetian's Zhou Dynasty, briefing serving as chancellor. It is not known when Zhou Yunyuan was born, but it is known that he was from Yu Prefecture. He passed the imperial examination in his...