Boii in the context of "Hallstatt culture"

The Celts (/kɛlts/ KELTS, see pronunciation for different usages) or Celtic peoples (/ˈkɛltɪk/ KEL-tik) were a collection of Indo-European peoples in Europe and Anatolia, identified by their use of Celtic languages and other cultural similarities. Major Celtic groups included the Gauls; the Celtiberians and Gallaeci of Iberia; the Britons, Picts, and Gaels of Britain and Ireland; the Boii; and the Galatians. The interrelationships of ethnicity, language and culture in the Celtic world are unclear and debated; for example over the ways in which the Iron Age people of Britain and Ireland should be called Celts. In current scholarship, 'Celt' primarily refers to 'speakers of Celtic languages' rather than to a single ethnic group.

The history of pre-Celtic Europe and Celtic origins is debated. The traditional "Celtic from the East" theory, says the proto-Celtic language arose in the late Bronze Age Urnfield culture of central Europe, named after grave sites in southern Germany, which flourished from around 1200 BC. This theory links the Celts with the Iron Age Hallstatt culture which followed it (c. 1200–500 BC), named for the rich grave finds in Hallstatt, Austria, and with the following La Tène culture (c. 450 BC onward), named after the La Tène site in Switzerland. It proposes that Celtic culture spread westward and southward from these areas by diffusion or migration. A newer theory, "Celtic from the West", suggests proto-Celtic arose earlier, was a lingua franca in the Atlantic Bronze Age coastal zone, and spread eastward. Another newer theory, "Celtic from the Centre", suggests proto-Celtic arose between these two zones, in Bronze Age Gaul, then spread in various directions. After the Celtic settlement of Southeast Europe in the 3rd century BC, Celtic culture reached as far east as central Anatolia, Turkey.

The Czechs (Czech: Češi, pronounced [ˈtʃɛʃɪ]; singular Czech, masculine: Čech [ˈtʃɛx], singular feminine: Češka [ˈtʃɛʃka]), or the Czech people (Český lid), are a West Slavic ethnic group and a nation native to the Czech Republic in Central Europe, who share a common ancestry, culture, history, and the Czech language.

Ethnic Czechs were called Bohemians in English until the early 20th century, referring to the former name of their country, Bohemia, which in turn was adapted from the late Iron Age tribe of Celtic Boii. During the Migration Period, West Slavic tribes settled in the area, "assimilated the remaining Celtic and Germanic populations", and formed a principality in the 9th century, which was initially part of Great Moravia, in form of Duchy of Bohemia and later Kingdom of Bohemia, the predecessors of the modern republic.

Hungary in its modern (post-1946) borders roughly corresponds to the Great Hungarian Plain (the Carpathian Basin) in Central Europe.

During the Iron Age, it was located at the crossroads between the cultural spheres of Scythian tribes (such as Agathyrsi, Cimmerians), the Celtic tribes (such as the Scordisci, Boii and Veneti), Dalmatian tribes (such as the Dalmatae, Histri and Liburni) and the Germanic tribes (such as the Lugii, Marcomanni). In 44 BC, the Sarmatians, Iazyges moved into the Great Hungarian Plain. In 8 AD, the western part of the territory (the so-called Transdanubia) of modern Hungary formed part of Pannonia, a province of the Roman Empire. Roman control collapsed with the Hunnic invasions of 370–410, the Huns created a significant empire based in present-day Hungary. In 453 they reached the height of their expansion under Attila the Hun. After the death of Attila, the empire collapsed in 455, and Pannonia became part of the Ostrogothic Kingdom. The western part of the Carpathian Basin was occupied by the Longobards and the eastern part by the Gepids. In 567, the Avars occupied the territory ruled by the Gepids. In 568, the Longobards moved to Italy from Transdanubia, and the Avars also occupied that territory, Khagan Bayan I established the Avar Khaganate. The Avars were defeated by the Franks and Bulgars, and their steppe-empire ended around 822.

Burebista (Ancient Greek: Βυρεβίστας, Βοιρεβίστας) was the king of the Getae and Dacian tribes from 82/61 BC to 45/44 BC. He was the first king who successfully unified the tribes of the Dacian kingdom, which comprised the area located between the Danube, Tisza, and Dniester rivers, and modern day Romania and Moldova. In the 7th and 6th centuries BC it became home to the Thracian peoples, including the Getae and the Dacians. From the 4th century to the middle of the 2nd century BC the Dacian peoples were influenced by La Tène Celts who brought new technologies with them into Dacia. Sometime in the 2nd century BC, the Dacians expelled the Celts from their lands. Dacians often warred with neighbouring tribes, but the relative isolation of the Dacian peoples in the Carpathian Mountains allowed them to survive and even to thrive. By the 1st century BC the Dacians had become the dominant power.

From 61 BC onwards Burebista pursued a series of conquests that expanded the Dacian kingdom. The tribes of the Boii and Taurisci were destroyed early in his campaigns, followed by the conquest of the Bastarnae and probably the Scordisci peoples. He led raids throughout Thrace, Macedonia, and Illyria. From 55 BC the Greek cities on the west coast of the Black Sea were conquered one after another. These campaigns inevitably culminated in conflict with Rome in 48 BC, at which point Burebista gave his support to Pompey. This in turn made him an enemy to Julius Caesar, who decided to start a campaign against Dacia. This plan fell through in 44 BC when Caesar was assassinated. Burebista himself was assassinated in a plot by the Dacian aristocracy at around the same time.

Over the course of nearly four centuries, the Roman Republic fought a series of wars against various Celtic tribes, whom they collectively described as Galli, or Gauls. Among the principal Gallic peoples described as antagonists by Greek and Roman writers were the Senones, Insubres, Boii, and Gaesatae.

The Romans first came into conflict with Gauls who entered Italy from the north. Some of these settled in the lands immediately south of the Alps, which became known as Cisalpine Gaul: "Gaul this side of the Alps". Gaulish armies, some perhaps fighting as mercenaries in the service of the cities of Magna Graecia, plundered territory in Etruria and Latium during the fourth century, famously sacking Rome circa 390 BC.

The history of the Czech lands – an area roughly corresponding to the present-day Czech Republic – starts approximately 800 years BCE. A simple chopper from that age was discovered at the Red Hill (Czech: Červený kopec) archeological site in Brno. Many different primitive cultures left their traces throughout the Stone Age, which lasted approximately until 2000 BCE. The most widely known culture present in the Czech lands during the pre-historical era is the Únětice Culture, leaving traces for about five centuries from the end of the Stone Age to the start of the Bronze Age. Celts – who came during the 5th century BCE – are the first people known by name. One of the Celtic tribes were the Boii (plural), who gave the Czech lands their first name Boiohaemum – Latin for the Land of Boii. Before the beginning of the Common Era the Celts were mostly pushed out by Germanic tribes. The most notable of those tribes were the Marcomanni and traces of their wars with the Roman Empire were left in south Moravia.

After the turbulent times of the Migration Period, the Czech lands were ultimately settled by the Slavic tribes. The year of 623 marks the formation of the first known state in the Czech lands, when Samo united the local Slavic tribes, defended their lands from the Avars to the east and – few years later – won the battle of Wogastisburg against the Franks invading the Czech lands from the west. The next state appearing in the Czech lands after the dissolution of the Samo's state was probably the Great Moravia. The center of its power lay in the area of Moravia and present-day western Slovakia. In 863, Cyril and Methodius, two scholars from Greece, brought Christianity to the Great Moravia and established the first Slavic script – Glagolitsa. The Great Moravia fell during the Magyar invasion at the start of the 10th century.

The history of Slovakia spans from prehistoric settlements to the modern Slovak Republic. Situated in Central Europe, the region’s earliest evidence of human habitation dates to the Palaeolithic era, with significant Neolithic and Bronze Age cultures. By the Iron Age, Celtic tribes like the Boii established settlements, later displaced by Germanic and Slavic migrations. The Slavs arrived in the 5th–6th centuries, forming the basis of Slavic states like Great Moravia (9th century), which adopted Christianity through Cyrillo-Methodian missionary activity.

Following Great Moravia’s collapse, the territory became part of the Kingdom of Hungary, enduring Mongol invasions and later Ottoman Wars that split Hungary into three parts. Much of present-day territory of Slovakia resisted Ottoman conquest and became a province of the Habsburg monarchy. The 19th century saw the rise of Slovak nationalism, fueled by figures like Ľudovít Štúr, who codified modern Slovak, and movements advocating autonomy within Austria-Hungary.