Mary I, who was no bloodier than her father or her siblings. If she'd been able to conceive an heir, England would likely have resumed being a Catholic country, tho it would have likely required a different husband than her second cousin once removed, both for there to be a kid and for England to not be embroiled in anti-Castilian patriotism against foreign rule. Phillip II was for many reasons the wrong husband for Mary to have wed.
That first sentence isn't true.
Less than 200 Catholic martyrs were executed in Elizabeth's 45-year reign,
and none were executed in her first 12 years,
while almost 300 Protestant martyrs were burned in Mary's 5 years on the throne. Edward VI killed much less than both of them in his 6 years, while Henry VIII seems to have made less martyrs than his daughters but considerably more than his son.
Poll
