Kuhina Nui was a powerful office in the Kingdom of Hawaiʻi from 1819 to 1864. It was usually held by a relative of the king and was the rough equivalent of the 19th century European office of Prime Minister or sometimes Regent.
Read more about Kuhina Nui: Origin of The Office, Conflict Between The Kuhina Nui and The King, The Constitution of 1840, The Constitution of 1852, End of The Office, List of Kuhina Nui