Lagos was already in the middle of the sixteenth century, the great base of support for the Discoveries, the place from which its main expeditions departed and where many of the products marketed.
This strategic importance of Lagos gave rise to a considerable economic development, which was translated in the fixation of many people in the city, originating its urban growth.
The continuous harassment that the city suffered on the part of the North African corso forced to the construction of a second waist of walls, adapted to the new concepts of the military architecture, that the generalization of the use of the artillery had introduced, and that the Portuguese, following the model Italian avant-garde, had been putting into practice in Morocco and in most of the territories integrated in the Empire.
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