Where was Lutetia?

Lutetia was a Gallo-Roman town on the site of what is now... Paris! Lutetia became the chief city of the Gallic civitas Parisioruin in Lugdunensis Quarta, becoming Parisius in the 5th c. A.D. Roman Lutetia was founded above the flood-prone point where the Bièvre, a tributary of the Seine, flows into that river. It was centered on the slopes of the hill later dedicated to Saint Genevieve, on the left bank of the Seine, (which became known as the Latin Quarter in the Middle Ages when the Sorbonne University was founded.) Outlying suburbs on an island across from the confluence, the Île de la Cité, became the modern center of Paris.