Roman Gaul consisted of an area of provincial rule in what would become modern day France, Belgium, Luxembourg, and western Germany. Roman control of the area lasted for nearly 600 years. The Roman Empire began its take-over of what was Celtic Gaul in 121BCE, when it conquered and annexed the southern reaches of the area. Julius Caesar completed the task by defeating the Celtic tribes in the Gallic Wars of 58-51BCE.
The Gaulish language and cultural identity would, in the five centuries between Caesar's conquest and the collapse of the Western Roman Empire, undergo a syncretism, and evolve into a hybrid Gallo-Roman culture. The Druid religion which existed in the area was ordered supressed by Emperor Claudius I, and Christianity was introduced. The last pockets of Gaulish speakers appear to have lingered until the 6th century. The Gallo-Roman,Vulgar Latin, language of the period then tranformed, under various linguistic influences, into the dialects of the modern French language. The Roman administration finally collapsed as troops were withdrawn south 455-475 and the Visigoths, the Burgundians and the Franks replaced the Empire.