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On the sign:
GOMES LOURENCO DO AVELAR HEROICO DEFENSOR DO REINO
PRIMEIRO DONATÁRIO DO CASTELO E CONCELHO DE CASCAIS 8 DE ABRIL DE 1970
The plaque on the wall of the Cascais citadel commemorates Gomes Lourenço de Avelar, a priest, soldier and Portuguese diplomat. He received from King Fernando I the castle and lands of Cascais and was the governor of the castle and the first lord of Cascais.
The citadel wall was photographed that day (the sign is not visible in the photo) Click for a larger image
Translation of the text on the sign: GOMES LOURENCO DO AVELAR HEROIC DEFENDER OF THE KINGDOM
FIRST GIVEAWAY OF THE CASTLE AND MUNICIPALITY OF CASCAIS APRIL 8, 1970