History of Monaco

The early history of Monaco is primarily concerned with the protective and strategic value of the Rock of Monaco, the area's chief geological landmark, which served first as a shelter for ancient peoples and later as a fortress. Part of Liguria's history since the fall of the Roman Empire, from the 14th to the early 15th century the area was contested for primarily political reasons. Since that point, excepting a brief period of French occupation, it has remained steadily under the control of the House of Grimaldi.

The Rock of Monaco served as a shelter for the area's early humans from the end of the Paleolithic period, approximately 400,000 BC, evidence of which has been found in a cave in St. Judist's Gardens. According to the accounts of historian Diodorus Siculus and geographer Strabo, the area's first permanent settlers were the mountain-dwelling Ligures, who emigrated from their native city of Genoa, Italy. However, the ancient Ligurian language, which probably was Indo-European, is not directly connected to the Italian dialect spoken by the modern inhabitants of Liguria, nor to the modern Monegasque language.

During the 6th-century BC. Phocaeans from Massalia (modern day Marseille) founded the colony of Monoikos. The name of the colony derives from the local veneration of the Greek demigod Hercules, also later adopted by the Romans, who was said to have constructed the ancient path that passed through the region from Spain to Italy. The Roman emperor Julian also wrote of Hercules's construction of Monaco's port and a coastal road. The road was dotted with altars to Hercules, and a temple dedicated to him was established on the Rock of Monaco. The name Port Hercules was subsequently used for the ancient port.Monoeci meaning "Single One" or Monoikos meaning "Single House" could be a reference to Hercules or his temple, or the isolated community inhabiting the area around the rock.

...
Wikipedia