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Before 1815, Brazil was a [[Colonial Brazil|colony]] of the [[Kingdom of Portugal]]. Thus, from the formal arrival of the Portuguese in 1500, when the land was claimed by the Portuguese Crown, until 1815 when the Kingdom of Brazil was created and the colonial bond was formally terminated and replaced by a political union with Portugal, the [[List of Portuguese monarchs|Kings of Portugal]] were Monarchs ''over'' Brazil.
During the colonial era, from 1645 onwards, the heir apparent of the Portuguese Crown was styled ''[[Prince of Brazil]]''. In 1817, in the wake of the creation of the United Kingdom of Portugal, Brazil and the Algarves, the heir apparent's title was changed to ''[[Prince Royal]]''.
Brazil had two monarchs during the United Kingdom epoch: Queen Maria I (1815–1816) and King John VI (1816–1822). By the time of the creation of the United Kingdom of Portugal, Brazil and the Algarves, Queen Maria I was long incapacitated, and the Portuguese Empire was ruled by Prince John, the future King John VI, as Prince Regent.