The Caesarian Civil War and Dictatorship

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Rubicon and Ilerda tree

Pharsalus tree

Zela and Caesar's victory tree

Caesar's death and succession tree

Alea Iacta Est

Crossing the Rubicon

  • [Cause] [Caesar crossed the Rubicon because returning without protection exposed him to prosecution]
    • [Negotiation] [Caesar sought a political office that would preserve legal immunity]
    • [Breakdown] [The Senate rejected the arrangement and left him no acceptable alternative]
  • [Event] [In January 49 BCE Caesar led Legio XIII from Cisalpine Gaul across the Rubicon into Italy] The act violated the law governing imperium and made armed conflict inevitable.
  • [Meaning] [Crossing the Rubicon means passing the point of no return]
  • [Optimates' response] [Pompey and many senators fled south because they overestimated Caesar's advancing force]
  • [Immediate result] [Caesar captured Rome without resistance]

Battle of Ilerda

  • [Strategic objective] [Caesar sought to neutralize Pompey's stronghold in Hispania]
  • [Pompeian base] [Pompey held Hispania as a major provincial base with many legions]
  • [Pompeian advantage] [Afranius and Petreius commanded five legions from strong ground near Ilerda] They controlled high ground and vital supplies.

Battle of Pharsalus

  • [Strategic objective] [Caesar pursued Pompey into Greece before Pompeian strength could grow]
  • [Significance] [Pharsalus became the decisive battle of the Caesarian civil war]
  • [Crisis] [Caesar's situation became critical because time favored Pompey]
  • [Forces] [Caesar fielded roughly 30,000 veteran infantry and 2,000 cavalry]
  • [Forces] [Pompey fielded roughly 47,000 infantry and 7,000 cavalry with positional superiority]
  • [Qualification] [The headline numbers obscure differences in combat experience]
  • [Pompeian strategy] [Pompey preferred Fabian delay and supply interdiction]
  • [Caesarian strategy] [Caesar needed decisive battle because delay favored Pompey]
  • [Position] [Pompey's army waited uphill while Caesar occupied lower ground]
  • [Initiative] [Pompey initially refused battle, leading Caesar to feign departure]
  • [Political pressure] [Confident Optimates pushed Pompey toward engagement]

Battle of Pharsalus

Battle Sequence

  • [Tactic] [Pompey ordered his line to remain still so Caesar's charging infantry would tire]
  • [Discipline] [Caesar's veterans recognized the tactic and paused before resuming their advance]
  • [Decisive reserve] [Six concealed cohorts were trained to counter Pompey's cavalry]
  • [Cavalry action] [Labienus drove back Caesar's cavalry on Pompey's left]
  • [Surprise] [Caesar revealed a fourth infantry line and ordered pila to be thrust rather than thrown]
  • [Result] [Pompey's cavalry panicked, suffered heavy casualties, and exposed the flank]

Pompey's Retreat and Death

  • [Collapse] [Pompey's retreat caused his legions to panic and flee]
  • [Camp] [Pompey expected a long battle but soon learned Caesar's troops were entering his camp]
  • [Flight] [Pompey escaped in disguise and sought new support in Egypt]
  • [Assassination] [Egyptian authorities killed Pompey in an attempt to please Caesar]
  • [Caesar's response] [Caesar wept when presented with Pompey's head] Pompey had been his longtime ally and son-in-law, and Caesar had intended to pardon him.

Battle of Zela

  • [Event] [Caesar defeated Pharnaces II near Zela in 47 BCE]
  • [Summary] [Veni, vidi, vici compresses the speed and completeness of the victory]
  • [Pharnaces' strategy] [Pharnaces delayed because Caesar faced many competing crises]
  • [Battle] [Pharnaces unexpectedly crossed the valley and attacked uphill while Caesar's camp was unfinished]
  • [Defense] [Roman pila stopped the scythed chariots that penetrated Caesar's thin line]
  • [Counterattack] [Caesar drove the Pontic army downhill, routed it, and captured its camp]

Mutiny of Caesar's Legions

  • [Open question] [What should Caesar do about the mutiny?]

Battle of Thapsus

  • [Campaign] [Thapsus continued Caesar's war against the remaining Optimates]

Caesar's Victory

Destruction of the Optimates

  • [Result] [Caesar destroyed much of Rome's oldest patrician elite]

Four Triumphs

  • [Ritual] [Triumphs displayed battle paintings, spoils, and prominent prisoners]
  • [Gallic triumph] [The conquest of Gaul doubled Roman territory and ended with the execution of the Gallic king]
  • [Egyptian triumph] [The Egyptian celebration was not a conventional territorial triumph]
  • [Pontic triumph] [The Pontic celebration did not commemorate permanent annexation]
  • [African triumph] [Romans objected to images showing Optimates dying]
  • [Reward] [Each soldier received one silver talent, roughly fifteen years of military pay]
  • [Public distribution] [Roman citizens received roughly four years of minimum wages]
  • [Senate] [Caesar expanded the Senate from about 300 to 1,000 members]
  • [Calendar reform] [Caesar established a twelve-month calendar] July and August were added in the inherited naming scheme, while December still preserves the Latin root for ten.

Death of Julius Caesar

Public Excess

  • [Crown test] [Caesar had Mark Antony offer him a crown publicly to test the crowd]
  • [Golden throne] [A golden Senate throne appeared extravagantly monarchical]
  • [Tribunes] [Caesar imprisoned a tribune who opposed public royal symbolism]

Root Cause

  • [Strategic error] [Caesar pardoned enemies who later organized his assassination]
  • [Conspirators] [Marcus Junius Brutus and Gaius Cassius led the plot]

Motives

  • [Urgency] [The conspirators acted before Caesar departed on further eastern campaigns]
  • [Dictatorship] [His title of dictator for life signaled the Republic's loss of power]
  • [Mercy paradox] [The enemies able to kill Caesar remained alive because he had pardoned them]

Ides of March

  • [Warnings] [A priest advised Caesar to stay home and his wife reported a nightmare]
  • [Condition] [Caesar was hungover]
  • [Persuasion] [Brutus argued that Caesar could not summon the Senate and then fail to attend]

Succession

  • [Antony] [Mark Antony's poor governance of Italy weakened his position as Caesar's principal heir]
  • [Octavian] [Campaign experience in Spain revealed Octavian's intelligence]
  • [Heir] [Caesar selected the eighteen-year-old Octavian partly because he lacked a son]

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