Duke of Aveiro

Raimundo of Lencastre, 4th Duke of Aveiro maintained his House's traditional support for the Habsburg monarchy, even after the 1640 national revolution in Portugal.

The succession was given to his niece, Maria de Guadalupe of Lencastre, who was married to the Spanish Duke of Los Arcos.

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.

("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.

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.