 Complete the following phrase:  Philip II of Spain ordered his construction in 1571, following a plan for renovation and general reinforcement of the city walls. The engineer in charge of designing it was the military engineer Giacomo Palearo, who goes by the name el Fratin, the viceroy of Navarra Vespasiano Gonzaga y Colonna also participated. They devised a defensive system in line with the theory of the Italian Renaissance which had been put into practice shortly before in the city of Antwerp, with the citadel carried out by Francesco Paciotto, who also helped to construct Turin. It was an enclosure in the shape of five-pointed star. All the possible angles of attack were controlled from each point of the star shaped border. Two of the points were pointed towards the interior of the city to control that area, as stated in the documents at the time, the engineer Antonelli informed Philip II in 1569. Pamplona is now more protected than a metropolis.. It has to have a main castle, so that the memory of the natural kings goverce remains ... its still necessary to secure with strength, against their wills.. The work should serve to defend against the extrinsic danger, and also intrinsic. Do not forget that the 