Scottish Gaelic (Gàidhlig) is a member of the Goidelic branch of Celtic languages. This branch also includes the Irish and Manx languages. It is distinct from the Brythonic branch of the Celtic languages, which includes Welsh, Cornish, and Breton. Scottish, Manx and Irish Gaelic are all descended from Old Irish. The language is often described as Scottish Gaelic, Scots Gaelic, or Gàidhlig to avoid confusion with the other two Goidelic languages. Outside Scotland, it is occasionally also called Scottish, a usage dating back over 1,500 years; for example Old English Scottas. Scottish Gaelic should not be confused with Scots, because since the 16th century the word Scots has by-and-large been used to describe the Lowland Anglic language, which developed from the northern form of early Middle English.