
"Celtic" is a branch of the Indo-European language family. The Celtic languages of the continent of Europe became extinct in the first few centuries after the Roman conquest, although they have left traces in languages such as German, French and English. The exact nature of the Continental Celtic languages, and relationships betweem them, is still a matter of research and debate.

The Celtic languages of Ireland and Britain (and Brittany) are traditionally grouped into two main branches, Goidelic ("Q-Celtic") and Brythonic ("P-Celtic"), because of a phonetic divergence that is thought to have developed in very ancient times.
Scottish Gaelic is the oldest surviving language in Scotland, and the only Celtic language to survive there to the present day. Although we know that there were Gaelic speakers in Scotland by the time of the Roman presence, we cannot say with certainty how long before that time Gaelic had been spoken in Scotland: probably for many centuries.
The term Scot originally referred to a Gaelic speaker, whether s/he was living in Scotland or Ireland. The kingdom of Scotland was built and dominated by Gaelic-speaking kings, saints, churchmen, and warriors, and this label stuck to Scotland rather than Ireland. At its height in the 12th century, Gaelic was spoken in most parts of Scotland, and even south of the English border.
English-speaking peoples settled in the Lothians of south-eastern Scotland in about the 6th century. The influence of the English language expanded during the reign of David son of Malcolm Canmore when he planted burghs and military outposts in many other parts of the Lowlands of Scotland after becoming king of Scotland in 1124. David brought people from the north of England and the Low Countries of Europe to the burghs, which introduced a new social order, and language, to Scotland which soon dominated the Lowlands. The people of the Highlands, however, held on to their identity as the 'Old Scots' and to their ancestral language, Gaelic.
Until the seventeenth century, Gaelic Scotland and Ireland were linked by a literary form of Gaelic, by dynastic intermarriage, and by the exchange of professional Gaelic scholars, poets, churchmen, lawyers, and warriors. These bonds were broken at the same time that Gaeldom in both Scotland and Ireland was beseiged politically, culturally, and economically by the English-speaking world. The fortunes of the language were tied to the native nobility; when they were assimilated or exiled (during the seventeenth century in Ireland, and the eighteenth century in Scotland), Gaelic lost the crucial infrastructure and patronage it needed to ensure its development and survival.
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