The Right Honourable (abbreviated "The Rt. Hon.") is an honorific prefix for senior politicians in some Commonwealth Realms. In Britain, the title is held to every member of the Privy Council. In the Republic of Ireland, though the Irish Privy Council was effectively abolished in 1922, the Lord Mayor of Dublin still uses the honorific.
... the then prince-regent Dom Pedro I established the independent Empire of Brazil. This lasted until the next emperor, Dom Pedro II was deposed in 1889 and a republican based ...