
The Battle of Actium was a naval battle in the last war of the Roman Republic, fought between the fleet of Octavian and the combined forces of Mark Antony and Queen Cleopatra of Egypt. It took place on 2 September 31 BC in the Ionian Sea near the promontory of Actium in Greece.

The Antikythera wreck is a Roman-era shipwreck dating from the second quarter of the first century BC.
Antony's Parthian War was a military campaign by Mark Antony, the eastern triumvir of the Roman Republic, against the Parthian Empire under Phraates IV.

The Battle of Carrhae was fought in 53 BC between the Roman Republic and the Parthian Empire near the ancient town of Carrhae. The Parthian general Surena decisively defeated a Roman invasion force under the command of Marcus Licinius Crassus, who died at the battle. It is commonly seen as one of the earliest and most important battles between the Roman and Parthian Empires and one of the most crushing defeats in Roman history. According to the poet Ovid in Book 6 of his poem Fasti, the battle occurred on the 9th day of June.

The Battle of Vesuvius was the first conflict of the Third Servile War which pitted the escaped slaves against a military force of militia specifically dispatched by Rome to deal with the rebellion.

The Battle of Mutina took place on 21 April 43 BC between the forces loyal to the Senate under Consuls Gaius Vibius Pansa and Aulus Hirtius, supported by the legions of Caesar Octavian, and the Caesarian legions of Mark Antony which were besieging the troops of Decimus Brutus. The latter, one of Caesar's assassins, held the city of Mutina in Cisalpine Gaul.

The Battle of Protopachium was fought in 89 BC at the start of the First Mithridatic War, between the Roman Republic and the Pontic Empire. The battle ended in a Roman defeat and their expulsion from Asia Minor.
The Battle of the Silarius River was the final, decisive action of the Roman Servile Wars. It occurred near the mouth of modern Sele River, southern Campania, southern Italy.

Caesar's Civil War was one of the last politico-military conflicts in the Roman Republic before the establishment of the Roman Empire. It began as a series of political and military confrontations, between Julius Caesar, his political supporters, and his legions, against the Optimates, the politically conservative and socially traditionalist faction of the Roman Senate, who were supported by Pompey and his legions.

In the course of his Gallic Wars, Julius Caesar invaded Britain twice: in 55 and 54 BC. On the first occasion Caesar took with him only two legions, and achieved little beyond a landing on the coast of Kent. The second invasion consisted of 628 ships, five legions and 2,000 cavalry. The force was so imposing that the Britons did not dare contest Caesar's landing in Kent, waiting instead until he began to move inland. Caesar eventually penetrated into Middlesex and crossed the Thames, forcing the British warlord Cassivellaunus to surrender as a tributary to Rome and setting up Mandubracius of the Trinovantes as client king.

The Cantabrian Wars, sometimes also referred to as the Cantabrian and Asturian Wars, were the final stage of the two-century long Roman conquest of Hispania, in what today are the provinces of Cantabria, Asturias and León, in northwestern Spain.

The Constitutional reforms of Augustus were a series of laws that were enacted by the Roman Emperor Augustus between 30 BC and 2 BC, which transformed the Constitution of the Roman Republic into the Constitution of the Roman Empire. The era that began when Augustus defeated Mark Antony and Cleopatra in the final war of the Roman Republic in 30 BC, and ended when the Roman Senate granted Augustus the title "Pater Patriae" in 2 BC

The constitutional reforms of Julius Caesar were a series of laws to the Constitution of the Roman Republic enacted between 49 and 44 BC, during Caesar's dictatorship. Caesar was murdered in 44 BC before the implications of his constitutional actions could be realized.

The constitutional reforms of Lucius Cornelius Sulla were a series of laws enacted by the Roman Dictator Lucius Cornelius Sulla between 82 and 80 BC, which reformed the Constitution of the Roman Republic.

The crisis of the Roman Republic refers to an extended period of political instability and social unrest from about 134 BC to 44 BC that culminated in the demise of the Roman Republic and the advent of the Roman Empire.

The Decapolis was a group of ten cities on the eastern frontier of the Roman Empire in the southeastern Levant in the first centuries BC and AD. They formed a group because of their language, culture, location, and political status, with each functioning as an autonomous city-state dependent on Rome. They are sometimes described as a league of cities, although some scholars believe that they were never formally organized as a political unit.

The First Triumvirate (60–53 BC) was an informal alliance among three prominent politicians in the late Roman Republic: Gaius Julius Caesar, Gnaeus Pompeius Magnus and Marcus Licinius Crassus.

The Gallic Wars were a series of military campaigns waged by the Roman proconsul Julius Caesar against numerous Gallic tribes between 58 BC and 50 BC. The wars culminated in the decisive Battle of Alesia in 52 BC, in which a complete Roman victory resulted in the expansion of the Roman Republic over the whole of Gaul. While militarily just as strong as the Romans, the Gallic tribes' internal divisions helped ease victory for Caesar, and Vercingetorix's attempt to unite the Gauls against Roman invasion came too late. Although Caesar portrayed the invasion as being a preemptive and defensive action, most historians agree that the wars were fought primarily to boost Caesar's political career and to pay off his massive debts. Still, Gaul was of significant military importance to the Romans, as they had been attacked several times by native tribes both indigenous to Gaul and farther to the north. Conquering Gaul allowed Rome to secure the natural border of the river Rhine.

The Battle of Italica was fought in 75 BC between a rebel army under the command of Lucius Hirtuleius a legate of the Roman rebel Quintus Sertorius and a Roman Republican army under the command of the Roman general and proconsul of Hispania Ulterior Quintus Caecilius Metellus Pius. The battle was fought near Italica and ended in a stunning victory for the Metellan army.

Julius Caesar, the Roman dictator, was assassinated by a group of senators on the Ides of March of 44 BC during a meeting of the Senate at the Theatre of Pompey in Rome. The senators stabbed Caesar 23 times. The senators claimed to be acting over fears that Caesar's unprecedented concentration of power during his dictatorship was undermining the Roman Republic, and presented the deed as an act of tyrannicide. At least 60 senators were party to the conspiracy, led by Marcus Brutus, Gaius Cassius and Decimus Brutus. Despite the death of Caesar, the conspirators were unable to restore the institutions of the Republic. The ramifications of the assassination led to the Liberators' civil war and ultimately to the Principate period of the Roman Empire.

Julius Caesar, the Roman dictator, had planned an invasion of the Parthian Empire which was to begin in 44 BC; however, due to his assassination that same year, the invasion never took place. The campaign was to start with the pacification of Dacia, followed by an invasion of Parthia. Plutarch also recorded that once Parthia was subdued the army would continue to Scythia, then Germania and finally back to Rome. These grander plans are found only in Plutarch's Parallel Lives, and their authenticity is questioned by most scholars.

The Battle of Lauron was fought in 76 BC by a rebel force under the command of the renegade Roman general Quintus Sertorius and an army of Roman Republic under the command of the Roman general Gnaeus Pompeius Magnus. The battle was part of the Sertorian War and ended in victory for Sertorius and his rebels. The battle was recorded in detail by Frontinus in his Stratagems and by Plutarch in his Lives of Sertorius and Pompey.

The First Mithridatic War was a war challenging the Roman Republic's expanding empire and rule over the Greek world. In this conflict, the Kingdom of Pontus and many Greek cities rebelling against Roman rule were led by Mithridates VI of Pontus against Rome and the allied Kingdom of Bithynia. The war lasted five years and ended in a Roman victory which forced Mithridates to abandon all of his conquests and return to Pontus. The conflict with Mithridates VI later resumed in two further Mithridatic Wars.

The Mithridatic Wars were three conflicts fought by Rome against the Kingdom of Pontus and its allies between 88 BC and 63 BC. They are named after Mithridates VI, the King of Pontus who initiated the hostilities after annexing the Roman province of Asia into its Pontic Empire and committing massacres against the local Roman population known as the Asian Vespers. As Roman troops were sent to recover the territory, they faced an uprising in Greece organized and supported by Mithridates. Mithridates was able to mastermind such general revolts against Rome and played the magistrates of the optimates party off against the magistrates of the populares party in the Roman civil wars. Nevertheless, the first war ended with a Roman victory, confirmed by the Treaty of Dardanos signed by Lucius Sulla and Mithridates. Greece was restored to Roman rule and Pontus was expected to restore the status quo ante bellum in Asia Minor.

The Roman conquest of the Iberian Peninsula was a process by which the Roman Republic seized territories in the Iberian Peninsula that were previously under the control of native Celtiberian tribes and the Carthaginian Empire. The peninsula had various ethnic groups and a large number of tribes. The Carthaginian territories in the south and east of the peninsula were conquered in 206 BC during the Second Punic War. Control was gradually extended over most of the Iberian Peninsula without annexations. It was completed after the end of the Roman Republic, by Augustus, the first Roman emperor, who annexed the whole of the peninsula to the Roman Empire in 19 BC.

Contacts between the Italian peninsula and the Armenian Highland go back to the Iron Age when the Etruscan civilization traded with the Kingdom of Urartu by way of Phrygia and Ancient Greece. Urartian bronzes; bull-headed cauldrons and pottery were excavated in various parts of Etruscan Italy, particularly in Tuscany. The Roman Republic played a pivotal role in the re-establishment of the Kingdom of Armenia in 189 BC. Antiochus III the Great was defeated at the Battle of Magnesia by the Romans which in turn allowed the Armenian strategoi of Antiochus, Artaxias and Zariadres to take control of an independent Armenian Kingdom. The Romans perceiving themselves as the legitimate successors of the Seleucids began to play a more aggressive role in the affairs of the Hellenistic world of Asia Minor starting with the acquisition of Pergamum in 133 BC. The Third Mithridatic War led Roman forces for the first time directly to the Armenian border. From that point on until the demise of the Kingdom of Armenia in 428, Rome played a significant role in the affairs of Armenia and Armenians. This article explores the history of that relationship, a relationship which alternated between harmony and conflict.

The Roman-Gallic Wars were a series of conflicts between the forces of ancient Rome and various groups identified as Gauls. Among these were the Senones, Insubres, Boii and Gaesatae.

The Second Mithridatic War was one of three wars fought between Pontus and the Roman Republic. This war was fought between King Mithridates VI of Pontus and the Roman general Lucius Licinius Murena.

The Second Triumvirate was the political alliance between three of the Roman Republic's most powerful figures: Octavian, Mark Antony, and Lepidus. Formally called the Triumvirate for Organizing the Republic, it was formed on 27 November 43 BC with the enactment of the Lex Titia, and existed for two five-year terms, covering the period until 33 BC. Unlike the earlier First Triumvirate, the Second Triumvirate was an official, legally established institution, whose overwhelming power in the Roman state was given full legal sanction and whose imperium maius outranked that of all other magistrates, including the consuls.

The Third Servile War, also called by Plutarch the Gladiator War and the War of Spartacus, was the last in a series of slave rebellions against the Roman Republic, known as the Servile Wars. The Third was the only one directly to threaten the Roman heartland of Italy. It was particularly alarming to Rome because its military seemed powerless to suppress it.

The Siege of Athens and Piraeus was a siege of the First Mithridatic War that took place from Autumn of 87 BC to the Spring and Summer of 86 BC. The battle was fought between the forces of the Roman Republic, commanded by Lucius Cornelius Sulla Felix on the one hand, and the forces of the Kingdom of Pontus and the Athenian City-State on the other. The Greek Pontian forces were commanded by Aristion and Archelaus.
The Siege of Uxellodunum was one of the last battles of the Gallic Wars. It took place in 51 BC at Uxellodunum. It was the last major military confrontation of the Gallic Wars and marked the pacification of Gaul under Roman rule. The battle resulted in a decisive Roman victory.

The Social War, also called the Italian or Marsic War, was waged from 91 to 87 BC between the Roman Republic and other cities and tribes in Italy which had hitherto been allies of Rome for centuries. The Italian allies wanted Roman citizenship, not only for the status and influence that came with it, but also for the right to vote in the Roman Republic. They believed that they should be treated equally to the Romans, given that they had formed cultural and linguistic connections with the Roman civilization and had been loyal allies for over two centuries. The Romans strongly opposed their demands and refused to grant them citizenship, thus leaving the Italian groups with fewer rights and privileges.

The Battle of Sucro was fought in 75 BC between a rebel army under the command of the Roman rebel Quintus Sertorius and a Roman army under the command of the Roman general Pompey. The battle was fought on the banks of the river Sucro near a town bearing the same name. It ended indecisively: with Sertorius winning a tactical victory but having to withdraw because Pompey's colleague Metellus and his army were approaching.

Sulla's civil wars were a series of civil wars in which Lucius Cornelius Sulla, a Roman statesman and general, attempted to take control of the Roman Republic.

Sulla's first civil war was one of a series of civil wars in ancient Rome, between Gaius Marius and Lucius Cornelius Sulla, between 88 and 87 BC. This was also the first in a succession of several internal conflicts, which eventually led to the dissolution of the Roman Republic and establishment of Augustus Caesar as emperor.

The Third Mithridatic War, the last and longest of the three Mithridatic Wars, was fought between Mithridates VI of Pontus and the Roman Republic. Both sides were joined by a great number of allies dragging the entire east of the Mediterranean and large parts of Asia into the war. The conflict ended in defeat for Mithridates, ending the Pontic Kingdom, ending the Seleucid Empire, and also resulting in the Kingdom of Armenia becoming an allied client state of Rome.

The Battle of Valentia was fought in 75 BC between a rebel army under the command of Marcus Perpenna Vento and general called Herennius both legates of the Roman rebel Quintus Sertorius and a Roman Republican army under the command of the Roman general Gnaeus Pompeius Magnus. The battle was fought at Valentia in Spain and ended in a stunning victory for the Pompeian army.