John IV of Portugal
Until the reign of King John IV of Portugal, the heir-apparent to the throne of Portugal had used the title of Prince of Portugal. After his succession to the throne, John IV sought to give his heir a more prestigious and noble title, "Prince of Brazil", alongside granting the heir of Portugal the title of Duke of Braganza. The title was created by King John IV of Portugal on 27 October 1645 in favor of his eldest son and heir Teodósio, to replace the title "Prince of Portugal". The eldest son and heir of the "Prince of Brazil" was styled Prince of Beira and Duke of Barcelos.