Resmo Church was built in the early 11th century and it is one of the oldest still used church in Sweden. The apsis, nave and western tower date from the original church. Wooden arches and the sacristy were added in the 18th century. There were originally two towers, but the eastern one was demolished in 1826.
There are some frescoes remaining from the late 12th century. The interior originate mainly from the 18th century.
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.