Massalia (Greek: Μασσαλία, romanized: Massalía; Latin: Massilia) was an ancient Greek colony (apoikia) on the Mediterranean coast, east of the Rhône. Settled by the Ionians from Phocaea in 600 BC, this apoikia grew up rapidly, and its population set up many outposts for trading in modern-day Spain, Corsica and Liguria. Massalia persisted as an independent colony until the Roman campaign in Gaul in the 1st Century BC. The ruins of Massalia still exist in the contemporary city of Marseille, which is considered the oldest city of France and one of Europe's oldest continuously inhabited settlements.
Massalia was established ca. 600 BC by Ionian Greek settlers from Phocaea, in Western Anatolia. After the capture of Phocaea by the Persians in 545 BC, a new wave of settlers fled towards the colony. A creation myth telling the meeting between the Greeks and the local population is given by Aristotle and Pompeius Trogus (see founding myth of Marseille).
After the middle of the 6th century BC, Massalia became an important trading post of the western Mediterranean area. It grew into creating colonies of its own on the sea coast of Gallia Narbonensis during the 4th and 3rd centuries BC, including Agathe (late 5th–early 4th c. BC), Olbia [fr] (ca. 325), Tauroentium (early 3rd c.), Antipolis and Nikaia (ca. mid-3rd c.). Massalia was known in ancient times for its explorers: Euthymenes travelled to the west African coast in the late 6th century BC, and Pytheas explored northwestern Europe in the late 4th century BC.