section_path: History/Antiquity (6th century BC – 5th century AD)
section_name: Antiquity (6th century BC – 5th century AD)
paragraph_text: Antiquity (6th century BC – 5th century AD)
  
  In 600 BC, Ionian Greeks from Phocaea founded the colony of Massalia (present-day Marseille). Celtic tribes penetrated parts of eastern and northern France, spreading through the rest of the country between the 5th and 3rd century BC. Around 390 BC, the Gallic chieftain Brennus and his troops made their way to Roman Italy, defeated the Romans in the Battle of the Allia, and besieged and ransomed Rome. This left Rome weakened, and the Gauls continued to harass the region until 345 BC when they entered into a peace treaty. But the Romans and the Gauls remained adversaries for centuries.
  
  Around 125 BC, the south of Gaul was conquered by the Romans, who called this region Provincia Nostra ("Our Province"), which evolved into Provence in French. Julius Caesar conquered the remainder of Gaul and overcame a revolt by Gallic chieftain Vercingetorix in 52 BC. Gaul was divided by Augustus into provinces and many cities were founded during the Gallo-Roman period, including Lugdunum (present-day Lyon), the capital of the Gauls. In 250–290 AD, Roman Gaul suffered a crisis with its fortified borders attacked by barbarians. The situation improved in the first half of the 4th century, a period of revival and prosperity. In 312, Emperor Constantine I converted to Christianity. Christians, who had been persecuted, increased. But from the 5th century, the Barbarian Invasions resumed. Teutonic tribes invaded the region, the Visigoths settling in the southwest, the Burgundians along the Rhine River Valley, and the Franks in the north.