The Portonovo Fort, located in the Conero Park, was built during the period of Napoleonic rule in the 19th century.During that period, the Adriatic coast, including the Conero area, was under the control of Napoleon Bonaparte. The Portonovo Fort was erected as part of the coastal defense system Napoleon wanted to protect the region from threats from the sea.The structure represents a significant example of Napoleonic military architecture, with its solid walls and strategic location on the cliff. The Portonovo Fort was part of a series of forts and fortifications along the coast designed to preserve security and defend territories controlled by the French Empire.Subsequently, over the years, the Portonovo Fort has undergone various transformations and changes of use. Today it has been restored and converted into a hotel, while preserving its historical and architectural importance.I apologize for the earlier error in my response and hope that this clarification will provide more accurate information about the historical context of the Portonovo Fort.