Also,
Magna Carta was not any kind of constitutional watershed, didnt establish any new principles amd indeed as a feudal contract barely counts as constitutional document at all.
Robert the Bruce wasnt a gallant champion of Scottish Independence seeking his rightful throne, he was an Anglo Norman noble with an eye to the main chance who wasn’t above inflicting some pretty serious devastation on regions of Scotland that supported rival aristos with much better claims to the throne.
Sparta wasnt some uniquely martial polity producing an unstoppable warrior citizenry. Its actual record in wars is pretty patchy, Thermopylae in particular was a catastrophic defeat.