Whithorn, is a royal burgh in the historic county of Wigtownshire in Dumfries and Galloway, Scotland, about 10 miles south of Wigtown. …Whithorn, is a royal burgh in the historic county of Wigtownshire in Dumfries and Galloway, Scotland, about 10 miles south of Wigtown. The town was the location of the first recorded Christian church in Scotland, Candida Casa "White/Shining House", built by Saint Ninian about 397 CE.