The succession was given to his niece, Maria de Guadalupe of Lencastre, who was married to the Spanish Duke of Los Arcos. She returned to Portugal with her younger son, while her husband and her older son stayed in Spain. She regained the control of her House and estates and recognised the suzerainty of the House of Braganza.
Due to the alleged participation of the 8th Duke of Aveiro in the Távora affair (a conspiracy against the King), all the possessions of the Dukes of Aveiro were confiscated, their coat-of-arms destroyed from the public places, their houses demolished and their lands salted. Only the Palace of the Dukes of Aveiro in Azeitão, Portugal remains (albeit with the destroyed coat of arms on its facade) as a testament to the family's previous might and power.
The Aveiro palace in Lisbon, demolished and salted, gave place to a stone memorial in order to perpetuate the memory of the shame of the House of Aveiro. In it the following text can be read (in Portuguese): Aqui foram arrasadas e salgadas as casas de José Mascarenhas, exautorado das honras de Duque de Aveiro e outras condemnado por sentença proferida na Suprema Juncta de Inconfidencia em 12 de Janeiro de 1759. Justiçado como um dos chefes do barbaro e execrando desacato que na noite de 3 de Septembro de 1758 se havia commetido contra a real e sagrada pessoa de D.José I. Neste terreno infame se não poderá edificar em tempo algum. ("In this place were put to the ground and salted the houses of José Mascarenhas, stripped of the honours of Duque de Aveiro and others, convicted by sentence proclaimed in the Supreme Court of Inconfidences on the 12th of January 1759. Put to Justice as one of the leaders of the most barbarous and execrable upheaval that, on the night of the 3rd of September 1758, was committed against the most royal and sacred person of the Lord Joseph I. In this infamous land nothing may be built for all time.")
After 1759 the title became abeyant. In 1939, D.Duarte Nuno, Duke of Braganza, authorized the use of the personal title of Duke of Aveiro to D.Caetano Henriques Pereira Faria Saldanha de Lancastre, Count of Alcáçovas, and of Duke of Torres Novas to his eldest son. Neither are descended from the Dukes of Aveiro and did not use the prerogative. The only legitimate relatives of José de Mascarenhas da Silva e Lancastre, 8th Duke of Aveiro, are descended from his sister Francisca das Chagas Mascarenhas and her husband the 1st Marquis of Lavradio.
When Peter of Lencastre, 5th Duke of Aveiro died in 1673, his niece Maria de Guadalupe of Lencastre was finally recognised by the Portuguese King as Duchess of Aveiro in 1679, on condition that she return to Portugal although she was married to the Spanish Duke of Los Arcos. Her husband opposed this; she divorced him, returned to her homeland and regained the House of Aveiro and their estates.
While the divorce was pending, King Carlos II of Spain tried to prevent her return to Portugal by granting her, in 1681, the Spanish title of Duchess of Aveyro (Spanish spelling). This title belongs today to the Spanish Carvajal family, with no relationship to the Lancastre family of Portugal. It is not a Portuguese title and is entirely separate from its Portuguese homonym.
"Nobreza de Portugal e do Brasil" – Vol. II, pages 342/347. Published by Zairol Lda., Lisbon 1989.
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