Late in the 3rd century AD, the invasion of Germanic tribes, beginning with the Alamans in 275 AD, caused many of the residents of the Left Bank to leave that part of the city and move to the safety of the Île de la Cité. Many of the monuments on the Left Bank were abandoned, and the stones used to build a wall around the Île de la Cité, the first city wall of Paris. A new basilica and baths were built on the island; their ruins were found beneath the square in front of the cathedral of Notre Dame.[25] Beginning in 305 AD, the name Lutetia was replaced on milestones by Civitas Parisiorum, or "City of the Parisii".