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On the sign:
A 28 DE SETEMBRO DE 1878.
FOI INAUGURADA EM CASCAIS NO PALACIO DA CIDADELA, A ILUMINACÃO ELÉCTRICA NO PAÍS.
NO SEU 115 ANIVERSARIO, A CÂMARA MUNICIPAL DE CASCAIS E A JUNTA DE FREGUESIA DE CASCAIS," COMEMORAM ESTA EFEMERIDE.
In 1878, during the celebrations of the 15th birthday of Prince Carlos (later Carlos I, King of Portugal), electric lights were switched on for the first time in Portugal, in the Cascais Castle. According to the sign’s content, it was placed in 1993.