Marcus Aurelius Antoninus ( or-EE-lee-əs; Latin: [ˈmaːrkʊs au̯ˈreːli.us antoːˈniːnʊs]; 26 April 121 – 17 March 180) was Roman emperor from 161 to 180 and a Stoic philosopher. He was a member of the Nerva–Antonine dynasty, the last of the rulers later known as the Five Good Emperors and the last emperor of the Pax Romana, an age of relative peace, calm, and stability for the Roman Empire lasting from 27 BC to 180 AD. He served as Roman consul in 140, 145, and 161.
Marcus Aurelius was the son of the praetor Marcus Annius Verus and his wife Domitia Calvilla. He was related through marriage to the emperors Trajan and Hadrian. Marcus was three when his father died, and he was raised by his mother and paternal grandfather. After Hadrian's adoptive son, Aelius Caesar, died in 138, Hadrian adopted Marcus's uncle Antoninus Pius as his new heir. In turn, Antoninus adopted Marcus and Lucius, the son of Aelius. Hadrian died that year, and Antoninus became emperor. Now heir to the throne, Marcus studied Greek and Latin under tutors such as Herodes Atticus and Marcus Cornelius Fronto. He married Antoninus's daughter Faustina in 145.
After Antoninus died in 161, Marcus acceded to the throne alongside his adoptive brother, who took the regnal name Lucius Aurelius Verus. Under the reign of Marcus Aurelius, the Roman Empire witnessed much military conflict. In the East, the Romans fought the Parthian War of Lucius Verus with a revitalised Parthian Empire and the rebel Kingdom of Armenia. Marcus defeated the Marcomanni, Quadi, and Iazyges in the Marcomannic Wars. These and other Germanic peoples began to represent a troubling reality for the Empire. He reduced the silver purity of the Roman currency, the denarius. The persecution of Christians in the Roman Empire appears to have increased during his reign, although his involvement is unlikely since there are no Christian sources ascribing him the blame, and he was praised by Justin Martyr and Tertullian. The Antonine Plague broke out in 165 or 166 and devastated the population of the Roman Empire, causing the deaths of five to ten million people. Lucius Verus may have died from the plague in 169. When Marcus himself died in 180, he was succeeded by his son Commodus.
Commodus's succession after Marcus has been a subject of debate among both contemporary and modern historians. The column and equestrian statue of Marcus Aurelius still stand in Rome, where they were erected in celebration of his military victories. As a philosopher, his work Meditations is one of the most important sources for the modern understanding of ancient Stoic philosophy. These writings have been praised by fellow writers, philosophers, monarchs, and politicians centuries after his death.
The major sources depicting the life and rule of Marcus Aurelius are patchy and frequently unreliable. The most important group of sources, the biographies contained in the Historia Augusta, claimed to be written by a group of authors at the turn of the 4th century AD, but it is believed they were in fact written by a single author (referred to here as 'the biographer') from about 395. The later biographies and the biographies of subordinate emperors and usurpers are unreliable, but the earlier biographies, derived primarily from now-lost earlier sources (Marius Maximus or Ignotus), are considered to be more accurate. For Marcus's life and rule, the biographies of Hadrian, Antoninus, Marcus, and Lucius are largely reliable, but those of Aelius Verus and Avidius Cassius are not.
A body of correspondence between Marcus's tutor Fronto and various Antonine officials survives in a series of patchy manuscripts, covering the period from c. 138 to 166. Marcus's own Meditations offer a window on his inner life, but are largely undateable and make few specific references to worldly affairs. The main narrative source for the period is Cassius Dio, a Greek senator from Nicaea who wrote a history of Rome from its founding to 229 in eighty books. Dio is vital for the military history of the period, but his senatorial prejudices and strong opposition to imperial expansion obscure his perspective. Some other literary sources provide specific details: the writings of the physician Galen on the habits of the Antonine elite, the orations of Aelius Aristides on the temper of the times, and the constitutions preserved in the Digest and Codex Justinianeus on Marcus's legal work. Inscriptions and coin finds supplement the literary sources.
Marcus was born in Rome on 26 April 121. His birth name is sometimes given as Marcus Annius Verus, but sources assign this name to him upon his father's death and unofficial adoption by his grandfather, upon his coming of age. He may have been known as "Marcus Annius Catilius Severus", at birth or some point in his youth, or "Marcus Catilius Severus Annius Verus". Upon his adoption by Antoninus as heir to the throne, he was known as "Marcus Aelius Aurelius Verus Caesar" and, upon his ascension, he was "Marcus Aurelius Antoninus Augustus" until his death; Epiphanius of Salamis, in his chronology of the Roman emperors included in his On Weights and Measures, calls him Marcus Aurelius Verus.
The father of Marcus Aurelius was Marcus Annius Verus (III). His gens Annia was of Italic origin, but settled at some point in the small colony of Ucubi (Colonia Claritas Iulia Ucubi) south-east of Córdoba in Iberian Baetica (modern Andalusia, Spain); the gens had legendary claims of descendance from Numa Pompilius. The Annii Veri rose to prominence in Rome in the late 1st century AD. Marcus's great-grandfather Marcus Annius Verus (I) was a senator and (according to the Historia Augusta) ex-praetor; his grandfather Marcus Annius Verus (II) was made patrician in 73–74. Through his grandmother Rupilia Faustina, Marcus was related to the Nerva-Antonine dynasty; Rupilla was the step-daughter of Salonia Matidia, who was the niece of the emperor Trajan.
Marcus's mother, Domitia Lucilla Minor (also known as Domitia Calvilla), was the daughter of the Roman patrician P. Calvisius Tullus and inherited a great fortune (described at length in one of Pliny's letters) from her parents and grandparents. Her inheritance included large brickworks on the outskirts of Rome – a profitable enterprise in an era when the city was experiencing a construction boom – and the Horti Domitia Calvillae (or Lucillae), a villa on the Caelian Hill of Rome. Marcus himself was born and raised in the Horti and referred to the Caelian Hill as 'My Caelian'.
The adoptive family of Marcus was the gens Aurelia, an old Roman gens. His adoptive father Antoninus Pius came from the Aurelii Fulvi, a branch of the Aurelii settled in the colony of Nemausus in Roman Gaul.
Marcus's sister, Annia Cornificia Faustina, was probably born in 122 or 123. His father probably died in 125 or 126 when Marcus was three years old during his praetorship. Though he can hardly have known his father, Marcus wrote in his Meditations that he had learned 'modesty and manliness' from his memories of his father and the man's posthumous reputation. His mother Lucilla did not remarry and, following prevailing aristocratic customs, probably did not spend much time with her son. Instead, Marcus was in the care of 'nurses', and was raised after his father's death by his grandfather Marcus Annius Verus (II), who had always retained the legal authority of patria potestas over his son and grandson. Technically this was not an adoption, the creation of a new and different patria potestas. Lucius Catilius Severus, described as Marcus's maternal great-grandfather, also participated in his upbringing; he was probably the elder Domitia Lucilla's stepfather. Marcus was raised in his parents' home on the Caelian Hill, an upscale area with few public buildings but many aristocratic villas. He also spent much of his childhood in a palace beside the Lateran, owned by his grandfather. Marcus thanks this grandfather for teaching him 'good character and avoidance of bad temper'. He was less fond of the mistress his grandfather took and lived with after the death of his wife Rupilia. Marcus was grateful that he did not have to live with her longer than he did.