かんじゅうかい 冠位十二階
1. first system to rank officials into 12 levels (603 CE)
Wikipedia definition
2. Twelve Level Cap and Rank System, established in 603, was the first of what would be several similar cap and rank systems established during the Asuka period of Japanese history. It was adapted from similar systems that were already in place in Sui dynasty China, Paekche and Koguryŏ. The officials wore silk caps that were decorated with gold and silver, and a feather that indicated the official's rank.
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