The title Duke of Albuquerque (in Portuguese Duque de Albuquerque) was created under the royal decree of May 19, 1886, of king Luís I of Portugal in favour of Dom João Afonso da Costa de Sousa de Macedo, 2nd Count of Mesquitela and 4th Viscount of Mesquitela.
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”Nobreza de Portugal e do Brasil" – Vol. II, page 215. Published by Zairol Lda., Lisbon 1989.