The crowns of Scotland and England were first formally united in 1603 when, on the death of Queen Elizabeth I, James VI of Scotland became simultaneously James I of England, establishing the dual monarchy. James VI had been notably successful, even after he left Scotland, in establishing a moderate Episcopalianism as the official church and isolating both the Catholics and the extreme Protestants, but his work was largely undone by the heavy-handedness of Charles I. Even then, the Covenanters in Scotland did not oppose the monarchy—only the actions of the reigning monarch and whilst Scottish religious sentiments were acutely divided between Presbyterian dissenters and Episcopalians who tended towards High Anglican and a degree of s…
Clark, Robert. "Treaty of Union between England and Scotland". The Literary Encyclopedia. First published 20 January 2006; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=1153, accessed 21 April 2015.]