According to the Kani court ranking law, for the Imperial Family, there were four levels of Ikai from Ippon (the highest rank given to an Imperial prince) to Shihon (the fourth rank given to an Imperial prince) and other officials had 30 levels from Shoichii (Senior First Rank) to Shosoige (the lowest court rank).
官位令によれば、位階は、皇族には一品（いっぽん）～四品（しほん）の品位（ほんい）4階があり、諸臣は正一位少初位下の30階があった。