 In the 4 June 1758 "Memórias Paroquiais", the parish priest José Cardoso das Neves, referred to Aguiar da Beira as a possession of the "Casa do Infantado", under the title of the Infante D. Pedro.By that time, it supported two judges, three representatives and prosecutor, as well as a population of 159 residents.In 1896, the municipality was extinguished and its territory integrated into Trancoso.