But when the English revolutionaries beheaded Charles I in 1649, the Scots rallied round his son, Charles II.
Charles II was always more well-liked than his father, so it was no surprise in 1649 when the Scots chose to rally around him when his father Charles I was beheaded in England. 
mnli hypothesis: Charles II was always more well-liked than his father, so it was no surprise in 1649 when the Scots chose to rally around him when his father Charles I was beheaded in England.  premise: But when the English revolutionaries beheaded Charles I in 1649, the Scots rallied round his son, Charles II.