On this day in 1553, King Edward VI of England died, leaving the crown to his cousin Lady Jane Grey, who ruled for only nine days. Edward—for those of you keeping track at home—was son to Henry VIII and Jane Seymour, the king’s third wife. Edward’s half-sister Mary Tudor—daughter of the king and his first wife, Catherine of Aragon—raised an army, claimed her throne, and imprisoned Grey. (If you’re still with me, Henry VIII was her maternal great uncle.) Anyway Mary I became the first queen regnant of England. And of course Elizabeth the First became the second.