Château de Montcornet was built between the 11th and 12th centuries by the first occupants, the Montcornets. In the 13th and 14th centuries, the fortress passed to Miles de Noyer and then to the Mello family. In 1446, Antoine I de Croy repurchased the castle and rebuilt it almost completely. In 1613, Charles of Gonzaga, who was in the process of building the nearby Charleville, capital of the Principauté d'Arches, purchases the castle. From then it passed into the hands of the Meillerais, then finally to the duke of Aiguillon, who dismantled it around 1760. Only ruins survive today.
The artefacts excavated from the castle grounds (keys, currency, pottery, bones, etc) are on display in a room of the castle.
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.