In principle, heads of Sekke and Seiga family became Dukes or Marquises, families whose ranks were below them became earls if they had produced many Dainagon (chief of the councilor of State), and otherwise they became viscounts.
おもに摂家や清華家の当主を公爵家・侯爵家とし、それ以下の家においては大納言を多く輩出した家を伯爵家、そうでない家を子爵家としている。