In ancient Rome, adoption of boys was a fairly common procedure, particularly in the upper senatorial class. The need for a male heir and the expense of raising children were strong incentives to have at least one son, but not too many children. Adoption, the obvious solution, also served to cement ties between families, thus fostering and reinforcing alliances.

In the Imperial period, the system also acted as a mechanism for ensuring a smooth succession, the emperor taking his chosen successor as his adopted son.

As Rome was ruled by a selected number of powerful families, every senator's duty was to produce sons to inherit the estate, family name and political tradition. But a large family was an expensive luxury. Daughters had to be provided with a suitable dowry and sons had to be pushed through the political offices of the cursus honorum.

The higher the political status of a family, the higher was the cost. Due to this, Roman families restricted the number of children, avoiding more than three. The six children of Appius Claudius Pulcher (lived 1st century BC) were considered unusual. Sometimes, not having enough children proved to be a wrong choice. Infants could die and the lack of male births was always a risk.

Ancient Rome was a thriving civilization that began growing on the Italian Peninsula as early as the 8th century BC. Located along the Mediterranean Sea and centered on the city of Rome, it expanded to become one of the largest empires in the ancient world.

In its approximately twelve centuries of existence, Roman civilization shifted from a monarchy to an aristocratic republic to an increasingly autocratic empire. Through conquest and assimilation, it came to dominate Southern Europe, Western Europe, Asia Minor, North Africa and parts of Eastern Europe. Rome was preponderant throughout the Mediterranean region, and was one of the most powerful entities of the ancient world. It is often grouped into "Classical Antiquity" together with ancient Greece, and their similar cultures and societies are known as the Greco-Roman world.

The Romans are still remembered today, including such names as Julius Caesar, Cicero, and Horace. Ancient Roman society contributed greatly to government, politics, warfare, art, literature, architecture, technology, religion, and language in the Western world. A civilization highly developed for its time, Rome professionalized and greatly expanded its military and created a system of government called res publica, the inspiration for some modern republics such as the United States and France. It achieved impressive technological and architectural feats, such as the construction of an extensive system of aqueducts and roads, as well as large monuments, palaces, and public facilities.

Rome (/ˈroʊm/; Italian: Roma pronounced [ˈroːma] ( listen); Latin: Rōma) is a city and special comune ("Roma Capitale") in Italy. Rome is the capital of Italy and the capital of Lazio (Latin: Latium). With 2.8 million residents in 1,285.3 km² (496.3 sq mi), it is also the country's largest and most populated comune and fourth-most populous city in the European Union by population within city limits. Between 3.2 and 3.7 million people live in the Rome metropolitan area. The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.

Rome's history spans two and a half thousand years. It was the capital city of the Roman Kingdom, the Roman Republic and the Roman Empire, which was the dominant power in Western Europe and the lands bordering the Mediterranean for over seven hundred years from the 1st century BC until the 7th century AD and the city is regarded as one of the birthplaces of western civilization. Since the 1st century AD Rome has been the seat of the Papacy and, after the end of Byzantine domination, in the 8th century it became the capital of the Papal States, which lasted until 1870. In 1871 Rome became the capital of the Kingdom of Italy, and in 1946 that of the Italian Republic.

Constantine the Great (Latin: Flavius Valerius Aurelius Constantinus Augustus; c. 27 February 272 – 22 May 337), also known as Constantine I or Saint Constantine, was Roman Emperor from 306 to 337. Well known for being the first Roman emperor to convert to Christianity, Constantine and co-Emperor Licinius issued the Edict of Milan in 313, which proclaimed religious tolerance of all religions throughout the empire.

The foremost general of his time, Constantine defeated the emperors Maxentius and Licinius during civil wars. He also fought successfully against the Franks, Alamanni, Visigoths, and Sarmatians during his reign—even resettling parts of Dacia which had been abandoned during the previous century. Constantine built a new imperial residence in place of Byzantium, naming it New Rome. However, in Constantine's honour, people called it Constantinople, which would later be the capital of the Eastern Roman Empire for over one thousand years. Because of this, he is thought of as the founder of the Eastern Roman Empire.