Caesar's civil war in the context of "Gallic Wars"

Cleopatra VII Thea Philopator (Koine Greek: Κλεοπάτρα Θεά Φιλοπάτωρ, lit. 'Cleopatra father-loving goddess'; 70/69 BC – 10 or 12 August 30 BC) was Queen of the Ptolemaic Kingdom of Egypt from 51 to 30 BC, and the last active Hellenistic pharaoh. A member of the Ptolemaic dynasty, she was a descendant of its founder Ptolemy I Soter, a Macedonian Greek general and companion of Alexander the Great. Her first language was Koine Greek, and she is the only Ptolemaic ruler known to have learned the Egyptian language, among several others. After her death, Egypt became a province of the Roman Empire, marking the end of the Hellenistic period in the Mediterranean, which had begun during the reign of Alexander (336–323 BC).

Born in Alexandria, Cleopatra was the daughter of Ptolemy XII Auletes, who named her his heir before his death in 51 BC. Cleopatra began her reign alongside her brother Ptolemy XIII, but a falling-out between them led to a civil war. Roman statesman Pompey fled to Egypt after losing the 48 BC Battle of Pharsalus against his rival Julius Caesar, the Roman dictator, in Caesar's civil war. Pompey had been a political ally of Ptolemy XII, but Ptolemy XIII had him ambushed and killed before Caesar arrived and occupied Alexandria. Caesar then attempted to reconcile the rival Ptolemaic siblings, but Ptolemy XIII's forces besieged Cleopatra and Caesar at the palace. Shortly after the siege was lifted by reinforcements, Ptolemy XIII died in the Battle of the Nile. Caesar declared Cleopatra and her brother Ptolemy XIV joint rulers, and maintained a private affair with Cleopatra which produced a son, Caesarion. Cleopatra traveled to Rome as a client queen in 46 and 44 BC, where she stayed at Caesar's villa. After Caesar's assassination, followed shortly afterwards by the sudden death of Ptolemy XIV (possibly murdered on Cleopatra's order), she named Caesarion co-ruler as Ptolemy XV.

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

Antony was a relative and supporter of Julius Caesar, and he served as one of his generals during the conquest of Gaul and Caesar's civil war. Antony was appointed administrator of Italy while Caesar eliminated political opponents in Greece, North Africa, and Spain. After Caesar's assassination in 44 BC, Antony joined forces with Lepidus, another of Caesar's generals, and Octavian, Caesar's great-nephew and adopted son, forming a three-man dictatorship known to historians as the Second Triumvirate. The Triumvirs defeated Caesar's killers, the Liberatores, at the Battle of Philippi in 42 BC, and divided the government of the Republic among themselves. Antony was assigned Rome's eastern provinces, including the client kingdom of Egypt, then ruled by Cleopatra VII, and was given the command in Rome's war against Parthia.

Marcus Porcius Cato Uticensis ("of Utica"; /ˈkeɪtoʊ/, KAY-toe; 95 BC – April 46 BC), also known as Cato the Younger (Latin: Cato Minor), was an influential conservative Roman senator during the late Republic. A staunch advocate for liberty and the preservation of the Republic’s principles, he dedicated himself to protecting the traditional Roman values he believed were in decline. A noted orator and a follower of Stoicism, his scrupulous honesty and professed respect for tradition gave him a political following which he mobilised against powerful generals of his day, including Julius Caesar and Pompey.

Before Caesar's civil war, Cato served in a number of political offices. During his urban quaestorship in 63 BC, he was praised for his honesty and incorruptibility in running Rome's finances. He passed laws during his plebeian tribunate in 62 BC to expand the grain dole and force generals to give up their armies and commands before standing in elections. He also frustrated Pompey's ambitions by opposing a bill brought by Pompey's allies to transfer the military command to Pompey against the Catilinarian conspirators. He opposed, with varying success, Caesar's legislative programme during Caesar's first consulship in 59 BC. Leaving for Cyprus the next year, he was praised for his honest administration and after his return was elected as praetor for 54 BC.

Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war. He subsequently became dictator from 49 BC until his assassination in 44 BC. Caesar played a critical role in the events that led to the demise of the Roman Republic and the rise of the Roman Empire.

In 60 BC, Caesar, Crassus, and Pompey formed the First Triumvirate, an informal political alliance that dominated Roman politics for several years. Their attempts to amass political power were opposed by many in the Senate, among them Cato the Younger with the private support of Cicero. Caesar rose to become one of the most powerful politicians in the Roman Republic through a string of military victories in the Gallic Wars, completed by 51 BC, which greatly extended Roman territory. During this time, he both invaded Britain and built a bridge across the river Rhine. These achievements and the support of his veteran army threatened to eclipse the standing of Pompey. The alliance between Caesar and Pompey slowly broke down and, by 50 BC, Pompey had realigned himself with the Senate. With his command expiring and the Gallic Wars largely concluded, the Senate ordered Caesar to step down from his military command and return to Rome. In early January 49 BC, Caesar openly defied the Senate by crossing the Rubicon and marching towards Rome at the head of an army. This began Caesar's civil war, which he won, leaving him in a position of near-unchallenged power and influence in 45 BC.

The siege of Alexandria was a series of skirmishes and battles occurring between the forces of Julius Caesar, Cleopatra VII, Arsinoe IV, and Ptolemy XIII, between 48 and 47 BC. During this time Caesar was engaged in a civil war against remaining Republican forces.

The siege was lifted by relief forces arriving from Syria. After a battle contesting those forces' crossing of the Nile delta, Ptolemy XIII and Arsinoe's forces were defeated.

Commentarii (Latin, Greek: hupomnemata) are notes to assist the memory, or memoranda. This original idea of the word gave rise to a variety of meanings: notes and abstracts of speeches for the assistance of orators; family memorials, the origin of many of the legends introduced into early Roman history from a desire to glorify a particular family; and diaries of events occurring in their own circle kept by private individuals. An example of this is the day-book drawn up for Trimalchio in Petronius's Satyricon (Satyricon, 53) by his actuarius, a slave to whom the duty was specially assigned. Other commentarii were memoirs of events in which they had taken part drawn up by public men. Examples of these are the Commentaries of Caesar: Commentarii de Bello Gallico on the Gallic Wars and Commentarii de Bello Civili on the civil wars; another example is that of Cicero on his consulship. Different departments of the imperial administration and certain high functionaries kept records, which were under the charge of an official known as a commentariis (cf. a secretis, ab epistulis). Municipal authorities also kept a register of their official acts.

The Commentarii Principis were the register of the official acts of the emperor. They contained the decisions, favourable or unfavourable, in regard to certain citizens; accusations brought before him or ordered by him; and lists of persons in receipt of special privileges. These must be distinguished from the commentarii diurni, a daily court-journal. At a later period records called ephemerides were kept by order of the emperor; these were much used by the collection of biographies known as Scriptores Historiae Augustae (see Augustan History). The Commentarii Senatus, only once mentioned (Tacitus, Annals, xv. 74) are probably identical with the Acta Senatus.

Decimus Junius Brutus Albinus (27 April 81 BC – September 43 BC) was a Roman general and politician of the late republican period and one of the leading instigators of Julius Caesar's assassination. He had previously been an important supporter of Caesar in the Gallic Wars and in the civil war against Pompey. Decimus Brutus is often confused with his distant cousin and fellow conspirator, Marcus Junius Brutus.

Due to a typographical error in a 16th-century English publication, he is often known in English-speaking popular culture as Decius Brutus.

The Batavians or Batavi were a Roman-era Germanic people that lived in Batavia in the eastern Rhine delta — an area that is now the Netherlands, but then lay upon the northernmost border of the Roman Empire in continental Europe. Their origins are uncertain, but they appear to have settled in Batavia around 50–15 BC, when a Rome-allied Chatti military elite joined a Celtic-influenced community that had already been living there long before the arrival of the Romans. Throughout the several centuries in which they appear in historical records the Batavians were continually associated with elite cavalry units in the Roman military, who were famous for their ability to cross rivers while armed and on horseback, without breaking line.

Batavia was already referred to by the Roman leader Julius Caesar as the "Island of the Batavi" (Latin: Insula Batavorum) in his account of his campaigns in Gaul in 58–52 BC — although he did not explain who the Batavi were. Tacitus, writing in about 100 AD, reported that they had a special old alliance (antiquae societatis) with the empire as major contributors to the Roman military, and they did not pay any other form of tribute or tax. Some modern scholars have suggested that this relationship was established by Caesar himself who had a Germanic cavalry unit which fought for him in Gaul, and then in his Roman civil war. According to these proposals, this force evolved into the later bodyguard of Caesar's imperial successors in the Julio-Claudian dynasty, who continued to recruit Batavians for this role.