Once Hideyoshi TOYOTOMI succeeded in dominating the whole country as Kanpaku (chief adviser to the Emperor), the highest aristocratic rank, he started to try controlling daimyo throughout the country by giving them official ranks and incorporating them into the Ritsuryo ranking system.
豊臣秀吉が公家の最高位である関白として天下統一を果たすと、諸国の大名に官位を授けて律令官位体系に取り込むことで統制を行おうとした。