Portuguese Use
During the reign of Emperor Pedro I, John VI of Portugal was created titular Emperor of Brazil by a provision of the Treaty on the recognition of the independence of Brazil, that was ratified and entered into force on 15 November 1825. On the same date, King John VI issued a Charter of Law to change his royal titles, so as to include his courtesy title of Emperor among them. King John VI would use the style Imperial and Royal Highness until his death on 10 March 1826.
King Pedro IV of Portugal also used the styling, having also been the first Emperor of Brazil as Emperor Pedro I of Brazil.
Read more about this topic: Imperial And Royal Highness