why were they never satisfied always changing things around?
The '''Monarchs of Brazil''' were the rulers of [[Brazil]], first as a kingdom united with Portugal in the [[United Kingdom of Portugal, Brazil and the Algarves]] (1815–1822), and subsequently as a sovereign and independent state, the [[Empire of Brazil]] (1822–1889).
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 of Portugal]]''.
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.
As an independent nation-state, Brazil had two monarchs: Emperors Pedro I (1822–1831) and Pedro II (1831–1889). In 1889, the monarchy was abolished in a military ''coup d'état'' that [[Proclamation of the Republic (Brazil)|proclaimed Brazil a republic]].
During the imperial era, King John VI of Portugal briefly held the honorific style of Titular Emperor of Brazil under the [[Treaty of Rio de Janeiro (1825)|1825 Treaty of Rio de Janeiro]], by which Portugal recognized the [[independence of Brazil]]. The style of Titular Emperor was a life title, and became extinct upon the holder's demise. John VI held the imperial title for a few months only, from the ratification of the Treaty in November 1825 until his death in March 1826. During those months, however, as John's imperial title was purely honorific, Emperor Pedro I remained the sole monarch of the empire.