The first written records for the history of France appeared in the Iron Age. What is now France made up the bulk of the region known to the Romans as Gaul. Greek writers noted the presence of three main ethno-linguistic groups in the area: the Gauls, Aquitani and Belgae. Over the first millennium BC the Greeks, Romans and Carthaginians established colonies on the Mediterranean coast and offshore islands. The Roman Republic annexed southern Gaul in the late 2nd century BC, and legions under Julius Caesar conquered the rest of Gaul in the Gallic Wars of 58–51 BC. A Gallo-Roman culture emerged, and Gaul was increasingly integrated into the Roman Empire. In the later stages of the empire, Gaul was subject to barbarian raids and migration. The Frankish king Clovis I united most of Gaul in the late 5th century. Frankish power reached its fullest extent under Charlemagne. The medieval Kingdom of France emerged from the western part of Charlemagne's Carolingian Empire, known as West Francia, and achieved increasing prominence under the rule of the House of Capet, founded in 987.
A succession crisis in 1328 led to the Hundred Years' War between the House of Valois and the House of Plantagenet. The war began in 1337 following Philip VI's attempt to seize the Duchy of Aquitaine from its hereditary holder Edward III of England, the Plantagenet claimant to the French throne. A notable figure of the war was Joan of Arc, a French peasant girl who led forces against the English, establishing herself as a national heroine. The war ended with a Valois victory in 1453, strengthening French nationalism and increasing the power and reach of the French monarchy. During the Ancien Régime over the next centuries, France transformed into a centralized absolute monarchy through the Renaissance and Reformation. At the height of the French Wars of Religion, France became embroiled in another succession crisis, as the last Valois king, Henry III, fought against factions of the House of Bourbon and House of Guise. Henry, the Bourbon King of Navarre, won and established the Bourbon dynasty. A burgeoning worldwide colonial empire was established in the 16th century.
