The Gallo-Roman conflict predominated from 60 BC to 50 BC, with the Romans emerging victorious in the conquest of Gaul by Julius Caesar. After the decline of the Roman Empire, a Germanic tribe known as the Franks took control of Gaul by defeating competing tribes. The "land of Francia," from which France gets its name, had high points of expansion under kings Clovis I and Charlemagne. In the Middle Ages, rivalries with England and the Holy Roman Empire prompted major conflicts such as the Norman Conquest and the Hundred Years' War. With an increasingly centralized monarchy, the first standing army since Roman times, and the use of artillery, France expelled the English from its territory and came out of the Middle Ages as the most powerful nation in Europe, only to lose that status to Spain following defeat in the Italian Wars. The Wars of Religion crippled France in the late 16th century, but a major victory over Spain in the Thirty Years' War made France the most powerful nation on the continent once more. In parallel, France developed its first colonial empire in Asia, Africa, and in the Americas. Under Louis XIV, France achieved military supremacy over its rivals, but escalating conflicts against increasingly powerful enemy coalitions checked French ambitions and left the kingdom bankrupt at the opening of the 18th century.