10 most difficult ancient Rome riddles

The Roman Theatre of Orange, France was built in the early 1st century. It is one of the best preserved of all Roman theatres and is currently used as a festival site called Chorégies d'Orange. In 1981, UNESCO declared the theatre as a World Heritage Site.

Both notations are correct and historically Roman numerals were often written less consistently than today. The notation 'IIII' is often seen on clock faces. The reason for that may be practical, to avoid confusing the IV and VI when the clock is held upside down (although other theories also exist).

The Tyrrhenian Sea is part of the Mediterranean Sea off the western coast of Italy. It is named for the Tyrrhenian people, identified since the 6th century BCE with the Etruscans of Italy.

In 286 Diocletian moved the capital of the Western Roman Empire from Rome to Mediolanum. It was from Milan that the Emperor Constantine issued the Edict of Milan in 313 AD, granting tolerance to all religions within the Empire, thus paving the way for Christianity to become the dominant religion of the Empire. After the city was besieged by the Visigoths in 402, the imperial residence was moved to Ravenna.

Vandals founded their kingdom in North Africa after years of journey through Pannonia, Gaul and Hispania. Geiseric, king of the Vandals, led his powerful fleet to sack Rome.

Ennius was a writer and poet who lived during the Roman Republic. He is often considered the father of Roman poetry. Although only fragments of his works survive, his influence in Latin literature was significant, particularly in his use of Greek literary models. Annales is his most famous work, and the first epic poem that covered the early history of the Roman state.

The porous light stone was used in the concrete of the dome to reduce its weight. Scientists estimated that, if normal weight concrete had been used throughout, the stresses in the arch would have been some 80% greater. The same technique was for the ceilings of the Colosseum.

In 47 p.n.e. King of Pontus Pharnaces II challenged Rome. Caesar led the flashy five-day campaign ended with a decisive victory at Zela. In a letter to the Senate, he summed it up "I came; I saw; I conquered".

Legio prima Parthica ("1st Parthian Legion") was founded in AD 197 by the Severus for his forthcoming war against Parthia. The legion's presence in the Middle East is recorded until the early 5th century.

De vita Caesarum, commonly known as The Twelve Caesars, is a set of twelve biographies of Julius Caesar and the first 11 emperors of the Roman Empire. It was considered very significant in antiquity and remains a primary source on Roman history. The book discusses the significant and critical period of the Principate from the end of the Republic to the reign of Domitian.