What origins are the Ulster Scots, (English ancestry, Celtic ancestry?)?

What origins are the Ulster Scots, (English ancestry, Celtic ancestry?)? I mean another confusing thing is that Irish people went to Scotland and they were called Scotti and Scotland at that time was more of Irish people, but then the Scottish went to Ulster, so it is like they went back to their roots from... show more What origins are the Ulster Scots, (English ancestry, Celtic ancestry?)?
I mean another confusing thing is that Irish people went to Scotland and they were called Scotti and Scotland at that time was more of Irish people, but then the Scottish went to Ulster, so it is like they went back to their roots from Scotland to Ireland, and by the way who are th Ulster Scots, celtic natives? or Anglo-Saxon?
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