It is not exactly known when the Abbaye de Sainte-Trinité in Lessay was established; other historians date it to 1056, Cologne University to 1105. The vaults of the church, built around 1100 are however probably the oldest in Normandy. The abbey flourished in the 12th and 13th centuries, but during the Hundred Years' War in 1356 it was burned and looted. The nave and tower were badly damaged and restored in 1385. Lessay Abbey suffered again in the French Wars of Religion, when it was looted twice. Again in World War II the bombings of Normandy invansion in 1944 destroyed it partially and restoration took 12 years.
References:Herceg Novi was founded (on a former small fishing village, existing since Roman Empire times) as a fortress in 1382 by first Bosnian King Stjepan Tvrtko I and was called Sveti Stefan or Castelnuovo. The Turks conquered Herceg Novi in 1482, and ruled for 200 years, until 1687. However, there was a short pause between 1538 and 1539 when it was held by the Spaniards before they were defeated in the Siege of Castelnuovo. Turkey ruled again until 1687, from then until 1797, the town was ruled by the Venetian Republic.
The Herceg Novi old town is amazing. It is on a fairly steep hill that leads all the way down to the sea. Wandering through the small stairways to the various plazas and fortresses is a many hour adventure.