sentences:  It was after this god that the Romans renamed the area "Portus Hercules Moneici", which has evolved to the present name of Monaco.The seat of the Prince of Monaco was established on the Rocher de Monaco ("Illustration 5") as a fortress in 1191 when the harbour, that is today lined by Monte Carlo, was acquired by the Republic of Genoa.The harbour and its immediate area were given to the Genoese by the Emperor Henry IV with the proviso that the Genoese protect the coastline from piracy.