Delgado was a general who was a candidate for the 1958 presidential election, promising to remove Salazar from office. He failed, went into exile and tried to organise a rebellion from outside the country. In 1965 he was shot dead by the Portuguese secret police when he was lured into an ambush when he tried to enter Portugal clandestinely. The plaque is here because Delgado arrived here from Porto on 16 May 1958.