Teodósio of Braganza or Teodósio of Portugal was a Portuguese Prince son of John IV of Portugal (first king of the House of Braganza) and his wife Luiza de Guzman (Luísa de Gusmão). In 1645 he was given the title of Prince of Brazil, a new crown-princely position thus created. Also, his father granted him the duchy as 10th Duke of Braganza, presumably after his uncle Duarte died in 1649. Wikipedia
The definitive Wikipedia entry for Teodósio Prince of Brazil. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Teod%c3%b3sio%2c_Prince_of_Brazil