Hinterburg is one of the four castles in a string along the Neckar River, built by the von Steinach family in the 1100s. It is the oldest of the four, serving a strategic purpose in allowing the lords to observe the Neckar and Steinachtal. One of the earliest records mentions Bligger von Steinach, c. 1160. His son, Bligger II, who was also a famous minstrel of the time, added much of the outer wall that helped drastically improve the castle's defensive posture. At one time it also had a dry moat with a drawbridge. The castle continued to be used up until the 1600s, largely in the service of the Elector Palatine. Afterwards it began to decay from neglect as it lost its importance in the era of cannon. There is no indication that it was ever seriously besieged.References:
The Arch of Constantine is situated between the Colosseum and the Palatine Hill. It was erected by the Roman Senate to commemorate Constantine I's victory over Maxentius at the Battle of Milvian Bridge in 312. Dedicated in 315, it is the largest Roman triumphal arch. The arch spans the Via triumphalis, the way taken by the emperors when they entered the city in triumph.
Though dedicated to Constantine, much of the decorative material incorporated earlier work from the time of the emperors Trajan (98-117), Hadrian (117-138) and Marcus Aurelius (161-180), and is thus a collage. The last of the existing triumphal arches in Rome, it is also the only one to make extensive use of spolia, reusing several major reliefs from 2nd century imperial monuments, which give a striking and famous stylistic contrast to the sculpture newly created for the arch.
The arch is 21 m high, 25.9 m wide and 7.4 m deep. Above the archways is placed the attic, composed of brickwork reveted (faced) with marble. A staircase within the arch is entered from a door at some height from the ground, on the west side, facing the Palatine Hill. The general design with a main part structured by detached columns and an attic with the main inscription above is modelled after the example of the Arch of Septimius Severus on the Roman Forum.