Count of Portalegre

Count of Portalegre is a Portuguese title of nobility created by Letters Patent dated 6 February 1498 by King Manuel I of Portugal granted to D. Diogo da Silva.

D. Diogo da Silva was the son of D. Rui Gomes da Silva, Governor of Campo Maior and his wife D. Isabel de Menezes, natural daughter of D. Pedro de Menezes, 1st Count of Vila Real.

Firstly to D. Pedro de Lancastre, son of the 1st Duke of Aveiro, with whom she had one daughter who died young.

The Habsburgs rewarded this House's fidelity with new honours and titles, elevating the 6th Count to the marquessate of Gouvêa, a Portuguese noble title granted by Letters Patent of King Philip III of Portugal, (IV of Spain), dated 20 January 1625).

His inheritable assets were passed on to his cousin, the 3rd Marquess of Lavradio, eldest grandson of his father's sister, whose legitimate issue continues to the present day.