In the era of 889 - 923, members of SUGAWARA no Michizane's clan, the rival of Okura's clan, met with misfortunes in succession, as in the followings: SUGAWARA no Michizane was relegated to Sanuki-no-mori (a governor of Sanuki Province), use of the term of Ako was disputed, Michizane was appointed to the chief of the Japanese envoy to Tang Dynasty China, and the Shotai Incident (in which Michizane was relegated to a post at Dazaifu in Kyushu) occurred.
寛平～延喜年間、大蔵一門のライバルである菅原一門は、菅原道真の讃岐守左遷、阿衡の紛議、道真の遣唐大使任命、昌泰の変と立て続けに災難にあっている。