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On the sign:
[Royal Coat of Arms of Portugal]
O MUITO ALTO E MUITO PODEROZO REY D JOÃO O IIII DE PORTUGAL NO SO SENHOR Q DEUS GUARDE MAN DOU FAZER ESTA FORTIFICAÇÃO SEN DO GOVERNADOR DAS ARMAS REAIS D ANº LUIS DE MENEZES Q SE PRINSI PIOU EM 9 DE MIO DE 1642 E SE ACA BOU EM A ERA DE 1648
Translation of the text on the sign: [Royal Coat of Arms of Portugal]
raised from the people and very strong João III, King of Portugal God will watch over him Consecrate this citadel of the Governor on the Royal Armoury Made by LUIS DE MENEZES Between May 1642 and 1648