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On the sign:
AS PORTAS DESTE CASTELO SE REUNIAM OS JUÍZES, VEREADORES, O ALCAIDE E OUTROS HOMENS BONS DO CONCELHO DE CASCAIS
The castle gate from the Middle Ages, of which only parts remain today. The castle was probably built in the 14th century, probably in 1364, the year Cascaisturned from a village into a city, in order to protect the city.