The Palatine Gate (Porta Palatina) is a Roman Age city gate located in Turin, Italy. The gate provided access through the city walls of Julia Augusta Taurinorum (modern Turin) from the North side and, as a result, it constituted the Porta Principalis Dextra (Right-Side Main Gate) of the old town.
Built in the 1st century during the Augustan Age or the Flavian Age, the Porta Principalis Dextra may predate the construction of the city walls and was perhaps built on the location of an earlier Republican Age gate.
This facility served as a city gate for a long time and was turned into a castrum in the 11th century, although it lost the internal structure of the cavaedium over the centuries. In 1404, after centuries of incursions and partial decay, the western tower was rebuilt and both towers got completed with battlements for defensive purposes.
The Palatine Gate represents the primary archaeological evidence of the city's Roman phase, and is one of the best preserved 1st-century BC Roman gateways in the world. Together with the ancient theatre's remains, located a short distance away, it is part of the so-called Archaeological Park, opened in 2006.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.