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On the sign:
I.H.S.V.M. EL=REI DOM IOÃO 4o. De FELICE MEMORIA MANDOU FA= ER ESTA FORTALEZA SENDo G.or DAS ARMAS Do ANto LVIZ DE MENEZES CÔDe De CANTANHEDe DoS SEVS CONEiros DeSTADo E G= Vrra VEADoR DE SVA FAda COMECOV NO ANNO DE 1681
The sign is above the entrance to the Cascais Citadel, a citadel designed to protect against attacks on the coastline and the mouth of the river Teho, and the city of Lisbon. This sign is from the period after the Restoration of the Independence of Portugal and was made in 1681