Gallia Narbonensis in the context of "Commentarii de Bello Gallico"

Gaul (Latin: Gallia) was a region of Western Europe first clearly described by the Romans, encompassing present-day France, Belgium, Luxembourg, and parts of Switzerland, the Netherlands, Germany, and Northern Italy. It covered an area of 494,000 km (191,000 sq mi). According to Julius Caesar, who took control of the region on behalf of the Roman Republic, Gaul was divided into three parts: Gallia Celtica, Belgica, and Aquitania. Archaeologically, the Gauls were bearers of the La Tène culture during the 5th to 1st centuries BC. This material culture was found throughout Gaul and as far east as modern-day southern Poland, Slovakia, and Hungary.

Warbands led by the Gaul Brennos sacked Rome in 387 BC, becoming the only time Rome was conquered by a foreign enemy in 800 years. However, Gallia Cisalpina was conquered by the Romans in 204 BC and Gallia Narbonensis in 123 BC. Gaul was invaded after 120 BC by the Cimbri and the Teutons, who were in turn defeated by the Romans by 103 BC. Julius Caesar finally subdued the largest part of Gaul in his campaigns from 58 to 51 BC. Roman control of Gaul lasted for five centuries, until the last Roman rump state, the Domain of Soissons, fell to the Franks in AD 486.

The Boii (Latin plural, singular Boius; Ancient Greek: Βόιοι) were a Celtic tribe of the later Iron Age, attested at various times in Cisalpine Gaul (present-day Northern Italy), Pannonia (present-day Austria and Hungary), present-day Bavaria, in and around present-day Bohemia (after whom the region is named in most languages; comprising the bulk of today's Czech Republic), parts of present-day Slovakia and Poland, and Gallia Narbonensis (located in modern Languedoc and Provence).

In addition, the archaeological evidence indicates that in the 2nd century BC Celts expanded from Bohemia through the Kłodzko Valley into Silesia, now part of Poland and the Czech Republic.

Commentarii de Bello Gallico (Classical Latin: [kɔm.mɛnˈtaː.ɾi.iː deː ˈbɛl.loː ˈɡal.lɪ.koː]; English: Commentaries on the Gallic War), also Bellum Gallicum (English: Gallic War), is Julius Caesar's first-hand account of the Gallic Wars, written as a third-person narrative. In it, Caesar describes the battles and intrigues that took place in the nine years he spent fighting the Celtic and Germanic peoples in Gaul who opposed Roman conquest.

The "Gaul" to which Caesar refers is ambiguous, as the term had various connotations in Roman writing and discourse during Caesar's time. Generally, Gaul included all of the regions primarily inhabited by Celts, aside from the province of Gallia Narbonensis (modern-day Provence and Languedoc-Roussillon), which had already been conquered in Caesar's time, therefore encompassing the rest of modern France, Belgium, Western Germany, and parts of Switzerland. As the Roman Republic made inroads deeper into Celtic territory and conquered more land, the definition of "Gaul" shifted. Concurrently, "Gaul" was also used in common parlance as a synonym for "uncouth" or "unsophisticated", as Romans saw Celtic peoples as uncivilized compared with themselves.

Marcus Vipsanius Agrippa (/əˈɡrɪpə/; c. 63 BC – 12 BC) was a Roman general and statesman who was a close friend, son-in-law and lieutenant to the Roman emperor Augustus. Agrippa is well known for his important military victories, notably the Battle of Actium in 31 BC against the forces of Mark Antony and Cleopatra. He was also responsible for the construction of some of the most notable buildings of his era, including the original Pantheon.

Born to a plebeian family c. 63 BC, in an uncertain location in Roman Italy, he met the future emperor Augustus, then known as Octavian, at Apollonia, in Illyria. Following the assassination of Octavian's great-uncle Julius Caesar in 44 BC, Octavian returned to Italy. Around this time, Agrippa was elected tribune of the plebs. He served as a military commander, fighting alongside Octavian and Caesar's former general and right-hand man Mark Antony in the Battle of Philippi. In 40 BC, he was praetor urbanus and played a major role in the Perusine war against Lucius Antonius and Fulvia, respectively the brother and wife of Mark Antony. In 39 or 38 BC, Agrippa was appointed governor of Transalpine Gaul. In 38 BC, he put down a rising of the Aquitanians and fought the Germanic tribes. He was made consul for 37 BC, despite being well below the usual minimum age of 43, in order to oversee the preparations for war against Sextus Pompey, who had cut off grain shipments to Rome.

Sextus Afranius Burrus (born AD 1 in Vasio, Gallia Narbonensis; died AD 62) was a prefect of the Praetorian Guard and was, together with Seneca the Younger, an advisor to the Roman emperor Nero, making him a very powerful man in the early years of Nero's reign.

Agrippina the Younger chose him as Prefect in 51 to secure her son Nero's place as emperor after the death of Claudius. For the first eight years of Nero's rule, Burrus and Nero's former tutor Seneca helped maintain a stable government. Burrus acquiesced to Nero's murder of Agrippina the Younger but lost his influence over Nero anyway. He died in 62, some say from poison, though officially he died of throat cancer.

Publius Terentius Varro Atacinus (Latin: [ˈpuːbliʊs tɛˈrɛntiʊs ˈwarːoː atakiːnʊs]; 82 – c. 35 BC) was a Roman poet, more polished in his style than the more famous and learned Varro Reatinus, his contemporary, and therefore more widely read by the Augustan writers. He was born in the province of Gallia Narbonensis, the southern part of Gaul with its capital at Narbonne, on the river Atax (now the Aude), for his cognomen Atacinus indicates his birthplace. Varro Atacinus was also in the neoteric circle, which included other notable poets such as Catullus and Marcus Furius Bibaculus.

Septimania is a historical region in modern-day southern France. It referred to the western part of the Roman province of Gallia Narbonensis that passed to the control of the Visigoths in 462, when Septimania was ceded to their king, Theodoric II. During the Early Middle Ages, the region was variously known as Gallia Narbonensis, Gallia, or Narbonensis. The territory of Septimania roughly corresponds with the modern French former administrative region of Languedoc-Roussillon that merged into the new administrative region of Occitanie. In the Visigothic Kingdom, which became centred on Toledo by the end of the reign of Leovigild, Septimania was both an administrative province of the central royal government and an ecclesiastical province whose metropolitan was the Archbishop of Narbonne. Originally, the Goths may have maintained their hold on the Albigeois, but if so it was conquered by the time of Chilperic I. There is archaeological evidence that some enclaves of Visigothic population remained in Frankish Gaul, near the Septimanian border, after 507.

The region of Septimania was invaded by the Andalusian Muslims in 719, renamed as Arbūnah and turned into a military base for future operations by the Andalusian military commanders. It passed briefly to the Emirate of Córdoba, which had been expanding from the south during the same century, before its subsequent conquest by the Christian Franks in 759, who by the end of the 9th century renamed it as Gothia or the Gothic March (Marca Gothica). Eventually, the Christian Franks chased the Muslim Arabs and Berbers away from Septimania and conquered Narbonne in 759, and the Carolingian king Pepin the Short came up reinforced. Septimania became a march of the Carolingian Empire and then West Francia down to the 13th century, though it was culturally and politically autonomous from the northern France-based central royal government. The region was under the influence of the people from the count territories of Toulouse, Provence, and ancient County of Barcelona. It was part of the wider cultural and linguistic region comprising the southern third of France known as Occitania. This area was finally brought under effective control of the French kings in the early 13th century as a result of the Albigensian Crusade, after which it was assigned governors. From the end of the thirteenth century Septimania evolved into the royal province of Languedoc.

Raetia or Rhaetia (/ˈriːʃ(i)ə/ REE-sh(ee-)ə, Latin: [ˈrae̯.ti.a]) was a province of the Roman Empire named after the Rhaetian people. It bordered on the west with the country of the Helvetii, on the east with Noricum, on the north with Vindelicia, on the south-west with Transalpine Gaul and on the south with Venetia et Histria, a region of Roman Italy.

It thus comprised the districts occupied in modern times by eastern and central Switzerland (containing the Upper Rhine and Lake Constance), southern Germany (Bavaria and most of Baden-Württemberg), Vorarlberg and the greater part of Tyrol in Austria, and part of northern Lombardy in Italy. The region of Vindelicia (today eastern Württemberg and western Bavaria) was annexed to the province at a later date than the others. The northern border of Raetia during the reigns of emperors Augustus and Tiberius was the River Danube. Later the Limes Germanicus marked the northern boundary, stretching for 166 km north of the Danube. Raetia was connected to Italy across the Alps over the Reschen Pass, by the Via Claudia Augusta.

Gallia Aquitania (/ˈɡæliə ˌækwɪˈteɪniə/, Latin: [ˈɡalːi.a akᶣiːˈtaːni.a]), also known as Aquitaine or Aquitaine Gaul, was a province of the Roman Empire. It lies in present-day southwest France and the comarca of Val d'Aran in northeast Spain, where it gives its name to the modern region of Aquitaine. It was bordered by the provinces of Gallia Lugdunensis, Gallia Narbonensis, and Hispania Tarraconensis.