How did Castel Sant’Elmo receive its six-pointed star shape?

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View of Naples, Italy, showing colorful buildings on hillsides along the coastline with a curved harbor and calm blue water. — Naples Naples, Italy.

Castel Sant’Elmo, which was originally founded in 1329 by Robert of Anjou, was re-created in the 16th century under the Spanish viceroys in the form of a six-pointed star. This architectural transformation was part of the evolution of military fortifications during that era, as defensive structures were redesigned to better withstand the advancements in heavy artillery and warfare.12