" Historically, the language we call Scots was a development of the Anglian speech of the Northumbrians who established their kingdom of Bernicia as far north as the Firth of Forth in the seventh century. This northern Anglo-Saxon language flourished in Lowland Scotland and emerged into a distinct language on its own, capable of rich expansion by borrowing from Latin, French and other sources with its own grammatical forms and methods of borrowing. By the time of the Makars of the fifteenth century it was a highly sophisticated poetic language, based on the spoken speech of the people, but enriched by many kinds of expansion, invention and 'aureation'. Distinct from literary English, but having much in common with it, literary Scots took its place in the late Middle Ages as one of the great literary languages of Europe. "

― David Daiches , Literature and Gentility in Scotland