The dialect spoken in Northern Ireland, Ulster Irish or Donegal Irish, is the one closest to Scottish Gaelic (which developed into a separate language from Irish Gaelic in the 17th century). Some words and phrases are shared with Scots Gaelic, and the dialects of east Ulster - those of Rathlin Island and the Glens of Antrim - were very similar to the dialect of Argyll, one of the parts of Scotland nearest to Northern Ireland.