da MuralhaFernandinadeLisboa (PDF). Lisboa: Masters thesis, U. Nova Lisboa. Retrieved 11 February 2021. Walking tour of cerca moura — "A Cerca de Al-Ušbuna"
following this calamity that the Great Fernandine Walls (Grandes MuralhasFernandinasdeLisboa) of Lisbon were built. On the lower end of the social scale