During the Iron Age, what is now Metropolitan France was inhabited by the Gauls, a Celtic people. The Gauls were conquered in 51 BC by the Roman Empire, which held Gaul until 486. The Gallo-Romans faced raids and migration from the Germanic Franks, who dominated the region for hundreds of years, eventually creating the medieval Kingdom of France. France emerged as a major European power in the Late Middle Ages, with its victory in the Hundred Years' War (1337 to 1453) strengthening French state-building and paving the way for a future centralized absolute monarchy. During the Renaissance, France experienced a vast cultural development and established the beginning of a global colonial empire. The 16th century was dominated by religious civil wars between Catholics and Protestants (Huguenots).