The Celtic languages are a group of related languages descended from Proto-Celtic. They form a branch of the Indo-European language family. The term "Celtic" was first used to describe this language group by Edward Lhuyd in 1707, following Paul-Yves Pezron, who made the explicit link between the Celts described by classical writers and the Welsh and Breton languages.
The Celts or Celtic peoples 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 and Gaels of Britain and Ireland; the Boii; and the Galatians. The relation between ethnicity, language and culture in the Celtic world is 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.
Galatia was an ancient area in the highlands of central Anatolia, roughly corresponding to the provinces of Ankara and Eskişehir, in modern Turkey. Galatia was named after the Gauls from Thrace, who settled here and became a small transient foreign tribe in the 3rd century BC, following the Gallic invasion of the Balkans in 279 BC. It has been called the "Gallia" of the East.
Gaul 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 km2 (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.
Insular Celtic languages are the group of Celtic languages spoken in Brittany, Great Britain, Ireland, and the Isle of Man. All surviving Celtic languages are in the Insular group, including Breton, which is spoken on continental Europe in Brittany, France. The Continental Celtic languages, although once widely spoken in mainland Europe and in Anatolia, are extinct.
The Volcae were a Gallic tribal confederation constituted before the raid of combined Gauls that invaded Macedonia c. 270 BC and fought the assembled Greeks at the Battle of Thermopylae in 279 BC. Tribes known by the name Volcae were found simultaneously in southern Gaul, Moravia, the Ebro valley of the Iberian Peninsula, and Galatia in Anatolia. The Volcae appear to have been part of the late La Tène material culture, and a Celtic identity has been attributed to the Volcae, based on mentions in Greek and Latin sources as well as onomastic evidence. Driven by highly mobile groups operating outside the tribal system and comprising diverse elements, the Volcae were one of the new ethnic entities formed during the Celtic military expansion at the beginning of the 3rd century BC. Collecting in the famous excursion into the Balkans, ostensibly, from the Greek point of view, to raid Delphi, a branch of the Volcae split from the main group on the way into the Balkans and joined two other tribes, the Tolistobogii and the Trocmi, to settle in central Anatolia and establish a new identity as the Galatians.
The Continental Celtic languages are the now-extinct group of the Celtic languages that were spoken on the continent of Europe and in central Anatolia, as distinguished from the Insular Celtic languages of the British Isles and Brittany. Continental Celtic is a geographic, rather than linguistic, grouping of the ancient Celtic languages.
The Aulerci Cenomani were a Gallic tribe dwelling in the modern Sarthe department during the Iron Age and the Roman period. The Cenomani were the most powerful of the Aulerci tribes.
The Tectosages or Tectosagii were one of the three ancient Gallic tribes of Galatia in central Asia Minor, together with the Tolistobogii and Trocmii.
Litavis is a Gallic deity whose cult is primarily attested in east-central Gaul during the Roman period. She was probably originally an earth-goddess. In medieval Celtic languages, various terms derived from *Litauia came to designate the Brittany Peninsula.
Tolistobogii is the name used by the Roman historian, Livy, for one of the three ancient Gallic tribes of Galatia in central Asia Minor, together with the Trocmi and Tectosages. The tribe entered Anatolia in 279 BC as a contingent of Celtic raiders from the Danube region, and settled in those regions of Phrygia which would later become part of the Roman province of Galatia. The Galatians retained their Celtic language through the 4th century AD, when Saint Jerome mentions that the Galatians still spoke a Celtic language in his times.
The various names used since classical times for the people known today as the Celts are of disparate origins.
The Gauls were a group of Celtic peoples of mainland Europe in the Iron Age and the Roman period. Their homeland was known as Gaul (Gallia). They spoke Gaulish, a continental Celtic language.
Common Brittonic, also known as British, Common Brythonic, or Proto-Brittonic, was a Celtic language spoken in Britain and Brittany.
Gaulish is an extinct Celtic language spoken in parts of Continental Europe before and during the period of the Roman Empire. In the narrow sense, Gaulish was the language of the Celts of Gaul. In a wider sense, it also comprises varieties of Celtic that were spoken across much of central Europe ("Noric"), parts of the Balkans, and Anatolia ("Galatian"), which are thought to have been closely related. The more divergent Lepontic of Northern Italy has also sometimes been subsumed under Gaulish.
Latin and Greek were the dominant languages of the Roman Empire, but other languages were regionally important. Latin was the original language of the Romans and remained the language of imperial administration, legislation, and the military throughout the classical period. In the West, it became the lingua franca and came to be used for even local administration of the cities including the law courts. After all freeborn male inhabitants of the Empire were universally enfranchised in 212 AD, a great number of Roman citizens would have lacked Latin, though they were expected to acquire at least a token knowledge, and Latin remained a marker of "Romanness".
The Galatians were a Celtic people dwelling in Galatia, a region of central Anatolia surrounding present-day Ankara, during the Hellenistic period. They spoke the Galatian language, which was closely related to Gaulish, a contemporary Celtic language spoken in Gaul.
The Tascodrugites were a sect active in Galatia in the fourth and fifth centuries AD, and possibly as late as the ninth. Ancient sources present them variously as Gnostics or heterodox Christians. Most likely they were Montanists.
The Nitiobroges were a Gallic tribe dwelling on the middle Garonne river, around their chief town Aginnon, during Iron Age and the Roman period.
