 The 3rd Count of Portalegre, D. Álvaro da Silva, was succeeded by his granddaughter, D. Filipa da Silva, thanks to a royal dispensation of the Lei Mental, which stated that all Crown assets, including titles of nobility, could only be inherited by male primogeniture.Filipa married twice, in both cases with distant cousins.Firstly to D. Pedro de Lancastre, son of the 1st Duke of Aveiro, with whom she had one daughter who died young.