The following year, the military architect Mateus Fernandes III was sent to Funchal in order to completely modify the defensive system of the city. Evidence of the work produced by this architect was published in the "Mapa de Mateus Fernandes" (1573), considered to be the oldest plan of the island of Funchal. The document identifies the major defenses of the city, which included a large fortification in the area around the dyke in Pena.