With the death of Mary of Guise in June 1560, there was a political vacuum. There was no obvious Catholic leader and Mary, Queen of Scots was in France, so the Protestants were able to take control.
In July 1560 the Treaty of Edinburgh led to the withdrawal of English and French soldiers and left Scotland to settle its own affairs.
In August 1560, The Reformation Parliament accepted the Reformation and brought the Pope’s influence over Scotland to an end. This resulted in celebration of the mass being forbidden in Scotland.