The Ducal Palace of Gandia was, from the 14th century, the residence of the Royal Dukes of Gandía, and from 1485, the Borja (Borgia) family. It was the birthplace of Saint Francis Borja.
The oldest part of the building dates from the 15th century in Valencian Gothic style, but was restored and turned into a sanctuary by the Society of Jesus. It is attached to the wall that surrounds the city and has two gates, a Gothic one and one from the Renaissance.
Its remarkable interior has some interesting spaces, like the Golden Gallery, made in Baroque style, and the Crown Hall.
Initially the Palace was designed as a civil Gothic style urban castle and was ultimately transformed into a comfortable fortified palace. The main entrance to the Palacio Ducal is a robust door with a rounded arch, which together with the hallways are the oldest elements of the Gothic palace. You enter from this area and there is an imposing central parade ground with an impressive exterior staircase by which you ascend to the halls, among which the Baroque style Salón de Coronas and Galeria Dorada are notable.
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.