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The Dukes of Barcelos (Portuguese: Duque de Barcelos) was a title of nobility granted by King Sebastian of Portugal on 5 August 1562 to the heir of the Duke of Braganza. After the Braganza accession to the throne, the title continued to be the title of the heir of the Duke of Braganza, alongside the title of Prince of Beira.
This title (originally Count of Barcelos) belonged to the Braganzas since Alphonse, 8th Count of Barcelos and 1st Duke of Braganza.
"Nobreza de Portugal e Brazil" - Vol II, page 401. Published by Zairol Lda., Lisbon 1989.