Rome to revolution
The borders of modern France are approximately the same as those of ancient Gaul, which was inhabited by Celtic Gauls. Gaul was conquered for Rome by Julius Caesar in the 1st century BC, and the Gauls eventually adopted Roman speech (Latin, from which the French language evolved) and Roman culture. Christianity first appeared in the 2nd and 3rd centuries AD, and became so firmly established by the fourth and fifth centuries that St. Jerome wrote that Gaul was the only region “free from heresy”.
In the 4th century AD, Gaul’s eastern frontier along the Rhine was overrun by Germanic tribes, principally the Franks, from whom the ancient name of “Francie” was derived. The modern name “France” derives from the name of the feudal domain of the Capetian Kings of France around Paris. The Franks were the first tribe among the Germanic conquerors of Europe after the fall of the Roman Empire to convert to Catholic Christianity rather than Arianism (their King Clovis did so in 498); thus France obtained the title “Eldest daughter of the Church” (La fille ainée de l’Église), and the French would adopt this as justification for calling themselves “the Most Christian Kingdom of France”.
Existence as a separate entity began with the Treaty of Verdun (843), with the division of Charlemagne's Carolingian Empire into East Francia, Middle Francia and Western Francia. Western Francia approximated the area occupied by modern France and was the precursor to modern France.
The Carolingian dynasty ruled France until 987, when Hugh Capet, Duke of France and Count of Paris, was crowned King of France. His descendants, the Direct Capetians, the House of Valois and the House of Bourbon, progressively unified the country through a series of wars and dynastic inheritance. In 1337, on the eve of the first wave of the Black Death, England and France went to war in what would become known as the Hundred Years' War.[16] The monarchy reached its height during the 17th century and the reign of Louis XIV of France. At this time France possessed the largest population in Europe (see Demographics of France) and had tremendous influence over European politics, economy, and culture. French became, and remained for some time, the common language of diplomacy in international affairs. Much of the Enlightenment occurred in French intellectual circles, and major scientific breakthroughs were achieved by French scientists in the 18th century. In addition, France obtained many overseas possessions in the Americas, Africa and Asia.