Rosslyn Chapel, properly named the Collegiate Church of St Matthew, was founded on a small hill above Roslin Glen as a Roman Catholic collegiate church (with between 4 and 6 ordained canons and two boy choristers) in the mid-15th century. Rosslyn Chapel and the nearby Roslin Castle are located at the village of Roslin, Midlothian, Scotland.

http://www.maybole.org/history/sketches/aboutscotland/sketchesaboutscotland.htm

  It was built by a Scottish noble and Lord Chancellor of Scotland named William Sinclair, 1st Earl of Caithness. Caithness is the northernmost county in Scotland which is known for its beauteously rugged terrain; the county from which this Protestant Laird claims his own title.