Nothing is known for sure about the founding of ancient Rome; it is prehistoric. The myth of Romulus and Remus is often told. They were supposedly raised by a she-wolf. Romulus killed Remus, and became the first king of Rome, for some time Romulus ruled alongside a Sabine King a neighboring tribe. There is no historical evidence of this, but the story is popular. Numa Pompilius was the next king.

With the overthrow of the Roman Kingdom began the Republican era. The new Roman Republic fought and conquered the people around it. In 390 BC, the town was invaded by Gauls. Between the third and second century BC, Rome fought against the rival Carthage. The Roman army captured and destroyed Carthage.

Only with Julius Caesar in the first century BC, did the city began to grow significantly, especially toward the Campo Marzio, at the north of Capitoline Hill, and its domain was extended to Britannia. Caesar was never crowned emperor, a title which, however, fell to his adopted son Octavian who took the throne under the name of Augustus.

Augustus "found a city of bricks and left it marble". With him, Rome reached one million inhabitants and this was the first time in history that has happened in the world. Later emperors also added new monuments, temples, and triumphal arches to ancient Rome.

With the decline of the Roman Empire, the city declined in importance and fell into ruin. Pope Gregory I created major reforms for the people. The city was ruled by the pope, and soon also became the capital of a state, the Papal States, which remained active until the nineteenth century. Popes, like the emperors, became richer over the centuries and the same happened with the counties ruled by them.

Rome experienced a second "rebirth" in importance during the Italian Renaissance. The city of monuments and churches was called the "capital of Christendom", as the home of the Basilica di San Giovanni Lateran, the most important church of the world. The masterpieces of the Renaissance geniuses, like Leonardo da Vinci and Michelangelo, embellished the city.

The power of the Pope lessened along with its state.

But with the Italian Risorgimento Rome experienced a third "rebirth". On September 20 1870, Garibaldi's army, which had the task of uniting all of Italy under the crown of Savoy, entered the city through a breach opened in the walls at Porta Pia and, the same year, Rome became the capital of the new Italian state. In a few decades Rome grew to be one of the most important capitals of Europe and of the world: in 1936 it was the capital of the Italian Empire, even if for a few years because of the second world war.

Today, Rome is a major European political and cultural center, containing the headquarters of the Food and Agriculture Organization of the United Nations. There are also numerous museums, basilicas and palaces, such as the Colosseum, and, in the Vatican City, St. Peter's Basilica, a brilliant example of the architecture of the Renaissance which can be found all over Rome.