The Roman Empire (Imperium Rōmānum, ; Koine and Medieval Greek: Βασιλεία τῶν Ῥωμαίων, tr. ) was the post-Roman Republic period of the ancient Roman civilization.

In historiography, ancient Rome is Roman civilization from the founding of the city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD, encompassing the Roman Kingdom, Roman Republic and Roman Empire until the fall of the western empire.

The Roman Empire was then divided between a Western Roman Empire, based in Milan and later Ravenna, and an Eastern Roman Empire, based in Nicomedia and later Constantinople, and it was ruled by multiple emperors (with the exception of the sole rule of Constantine between 324 and 337, and Theodosius between 392 and 395).

In historiography, the Western Roman Empire refers to the western provinces of the Roman Empire at any time during which they were administered by a separate independent Imperial court; in particular, this term is used to describe the period from 395 to 476, where there were separate coequal courts dividing the governance of the empire in the Western and the Eastern provinces, with a distinct imperial succession in the separate courts.

The Roman Empire was then divided between a Western Roman Empire, based in Milan and later Ravenna, and an Eastern Roman Empire, based in Nicomedia and later Constantinople, and it was ruled by multiple emperors (with the exception of the sole rule of Constantine between 324 and 337, and Theodosius between 392 and 395).

Constantinople (Cōnstantīnopolis) was the capital city of the Roman/Byzantine Empire (330–1204 and 1261–1453), and also of the brief Crusader state known as the Latin Empire (1204–1261), until finally falling to the Ottoman Empire (1453–1923).

The Roman Empire (Imperium Rōmānum, ; Koine and Medieval Greek: Βασιλεία τῶν Ῥωμαίων, tr. ) was the post-Roman Republic period of the ancient Roman civilization.

Koine Greek, also known as Alexandrian dialect, common Attic, Hellenistic or Biblical Greek, was the common supra-regional form of Greek spoken and written during the Hellenistic period, the Roman Empire, and the early Byzantine Empire, or late antiquity.

The Roman Empire (Imperium Rōmānum, ; Koine and Medieval Greek: Βασιλεία τῶν Ῥωμαίων, tr. ) was the post-Roman Republic period of the ancient Roman civilization.

The beginning of Medieval Greek is occasionally dated back to as early as the 4th century, either to 330 AD, when the political centre of the Roman Empire was moved to Constantinople, or to 395 AD, the division of the Empire.

The Roman Empire was then divided between a Western Roman Empire, based in Milan and later Ravenna, and an Eastern Roman Empire, based in Nicomedia and later Constantinople, and it was ruled by multiple emperors (with the exception of the sole rule of Constantine between 324 and 337, and Theodosius between 392 and 395). The Eastern Empire, known in the post-Roman West as the Byzantine Empire, collapsed when Constantinople fell to the Ottoman Turks of Mehmed II in 1453.

The Byzantine Empire, also referred to as the Eastern Roman Empire and Byzantium, was the continuation of the Roman Empire in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinople (modern-day Fatih, İstanbul, and formerly Byzantium).

From the constitutional reforms of Augustus to the crisis of the third century, the Empire was a principate ruled from the city of Rome (27 BC - 285 AD).

Eventually, the city successively became the capital of the Roman Kingdom, the Roman Republic and the Roman Empire, and is regarded as the birthplace of Western civilization and by some as the first ever metropolis.

The Roman Empire was then divided between a Western Roman Empire, based in Milan and later Ravenna, and an Eastern Roman Empire, based in Nicomedia and later Constantinople, and it was ruled by multiple emperors (with the exception of the sole rule of Constantine between 324 and 337, and Theodosius between 392 and 395).

The Dominate or late Roman Empire is the name sometimes given to the "despotic" later phase of imperial government, following the earlier period known as the "Principate", in the ancient Roman Empire.

In the mid-1st century BC Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the conquest of Ptolemaic Egypt.

Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC), known by his nomen and cognomen Julius Caesar, was a Roman politician, military general, and historian who played a critical role in the events that led to the demise of the Roman Republic and the rise of the Roman Empire.

The previous Republic, which had replaced Rome's monarchy in the 6th century BC, became severely destabilized in a series of civil wars and political conflict.

Little is certain about the kingdom's history, as no records and few inscriptions from the time of the kings survive, and the accounts of this period written during the Republic and Empire are thought to be based on oral tradition.

In the mid-1st century BC Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the conquest of Ptolemaic Egypt.

Marcus Antonius (14 January 83 BC – 1 August 30 BC), commonly known in English as Mark Antony or Anthony, was a Roman politician and general who played a critical role in the transformation of the Roman Republic from an oligarchy into the autocratic Roman Empire.

The Roman Empire was then divided between a Western Roman Empire, based in Milan and later Ravenna, and an Eastern Roman Empire, based in Nicomedia and later Constantinople, and it was ruled by multiple emperors (with the exception of the sole rule of Constantine between 324 and 337, and Theodosius between 392 and 395).

In 286 Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by Diocletian who assumed the title Augustus of the East), a status which the city maintained during the Tetrarchy system (293–324).

Octavian's power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power and the new title Augustus, effectively making him the first emperor.

The Roman emperors were rulers of the Roman Empire, wielding power over its citizens and military, dating from the granting of the title of Augustus to Gaius Julius Caesar Octavianus by the Roman Senate in 27 BC. Augustus maintained a façade of republican rule, rejecting monarchical titles but calling himself princeps senatus (first man of the senate) and princeps civitatis (first citizen of the state).

In the mid-1st century BC Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the conquest of Ptolemaic Egypt.

After the death of Cleopatra, Egypt became a province of the Roman Empire, marking the end of the Hellenistic period that had lasted since the reign of Alexander (336–323 BC).

From the constitutional reforms of Augustus to the crisis of the third century, the Empire was a principate ruled from the city of Rome (27 BC - 285 AD).

The Crisis of the Third Century, also known as Military Anarchy or the Imperial Crisis (AD 235–284), was a period in which the Roman Empire nearly collapsed under the combined pressures of invasion, civil war, plague, and economic depression.

The Eastern Empire, known in the post-Roman West as the Byzantine Empire, collapsed when Constantinople fell to the Ottoman Turks of Mehmed II in 1453.

The capture of the city (and two other Byzantine splinter territories soon thereafter) marked the end of the Byzantine Empire, a continuation of the Roman Empire, an imperial state dating to 27 BC, which had lasted for nearly 1,500 years.

In the mid-1st century BC Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the conquest of Ptolemaic Egypt.

The Roman province of Egypt (Aegyptus, ; Αἴγυπτος Aigyptos ) was established in 30 BC after Octavian (the future Roman emperor Augustus) defeated his rival Mark Antony, deposed Pharaoh Cleopatra, and annexed the Ptolemaic Kingdom to the Roman Empire.

Christians rose to power in the 4th century following the Edict of Milan in 313 and the Edict of Thessalonica in 380.

With the Edict of Thessalonica in 380 AD, Emperor Theodosius I made Nicene Christianity the Empire's state religion.

The first two centuries of the Empire were a period of unprecedented stability and prosperity known as the Pax Romana ("Roman Peace").

The Pax Romana (Latin for "Roman Peace") was a long period of relative peace and stability experienced by the Roman Empire.

Due to the Roman Empire's vast extent and long endurance, the institutions and culture of Rome had a profound and lasting influence on the development of language, religion, architecture, philosophy, law, and forms of government in the territory it governed, particularly Europe.

This legacy survived the demise of the empire itself (5th century AD in the West, and 15th century AD in the East) and went on to shape other civilisations, a process which continues to this day.

Octavian's power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power and the new title Augustus, effectively making him the first emperor.

It survived the overthrow of the kings in 509 BC, the fall of the Roman Republic in the 1st century BC, the division of the Roman Empire in 395 AD, the fall of the Western Roman Empire in 476 AD, and the barbarian rule of Rome in the 5th, 6th, and 7th centuries.

It reached its greatest territorial expanse during the reign of Trajan (98–117 AD).

The borders of the Roman Empire, which fluctuated throughout the empire's history, were a combination of natural frontiers (most notably the Rhine and Danube rivers) and man-made fortifications which separated the lands of the empire from the countries beyond.

It had a government headed by emperors and large territorial holdings around the Mediterranean Sea in Europe, North Africa, and West Asia.

The Romans called it Mare Magnum 'Great Sea' or Mare Internum 'Internal Sea' and, starting with the Roman Empire, Mare Nostrum 'Our Sea'.

Due to the Roman Empire's vast extent and long endurance, the institutions and culture of Rome had a profound and lasting influence on the development of language, religion, architecture, philosophy, law, and forms of government in the territory it governed, particularly Europe.

Roman architecture flourished in the Roman Republic and even more so under the Empire, when the great majority of surviving buildings were constructed.

Classical and Roman art had a profound impact on the late medieval Italian Renaissance, while Rome's republican institutions influenced the political development of later republics such as the United States and France.

Roman art refers to the visual arts made in Ancient Rome and in the territories of the Roman Empire.