The National Archive of Torre do Tombo (Portuguese: Arquivo National da Torre do Tombo, [ɐɾˈkivu nɐsjuˈnaɫ dɐ ˈtoʁɨ ðu ˈtõbu]) is the Portuguese national archive established in 1378, located in center-north Lisbon, and renamed the Instituto dos Arquivos Nacionais (Institute of the National Archives) in 2009.
More information on the Wikipedia page [1]
The website, in Portuguese, is [2].