Named after the Porte de Montreuil, the gate facing the town of Montreuil.
One of 17 gates in the Thiers wall, it controlled the road from Paris to Rosny, today's RN 302. The name Montreuil comes from the Latin Monasteriolum, ‘small monastery’. The Montreuil flea market is held on the glacis, the open strip in front of the old fortifications.