Scottish Gaelic is one of the languages of Scotland, along with Scots and English. It is closely related to Irish Gaelic, and both belong to the Celtic group of the Indo-European language family. Scholars have suggested that Celtic-speaking peoples moved into Ireland and Britain some time before 300 B.C.E. and that the dialects of these British Celts later split into two groups: P-Celtic, including what we know today as Welsh, Breton, and Cornish; and Q-Celtic, including Irish, Scottish Gaelic, and Manx (the Gaelic of the Isle of Man).