The post of Goi no Kurodo had existed beforehand as well, but there was also the post of Mui no Kurodo (Chamberlain with No Rank), meaning that the official ranks for eight positions of Kurodo were not always standardized.
これ以前にも五位蔵人は存在していたが、無位の蔵人もあり、蔵人8人の位階は必ずしも一定しなかった。