The Kurodo no to, an official position outside of the Ritsuryo system (these positions were known as Ryoge no kan), was effectively the head of the Kurodo dokoro (chamberlain's office) (the nominal head, also known as the Kurodo betto, was also a minister).
蔵人頭（くろうどのとう）とは、令外官の役職で、蔵人所の実質的な長（名目的な長官は他に「蔵人別当」と呼んで大臣が兼任していた）。