Henry VIII
Henry VIII was King of England from 1509 to 1547. He is of course famous for having six wives, one after another: Catherine of Aragon, Anne Boleyn, Jane Seymour, Anne of Cleves, Catherine Howard, and Catherine Parr. When he divorced his first wife, Catherine of Aragon, the Pope excommunicated him from the Catholic Church, and Henry VIII became the head of the Church of England. He also divorced Anne of Cleves. He beheaded both this second and his fifth wives, Anne Boleyn and Catherine Howard, while his third wife Jane Seymour died. This is how to remember what happened to Henry's six wives: divorced, beheaded, died - divorced, beheaded, survived.

We don't really know how good Henry VIII was at maths, or whether he lost count of all the wives he had. However, we do know that he owned several mathematical instruments, such as globes and sundials. Also, he employed the famous German mathematician Nicolaus Kratzer as his official astrologer. Nicolaus Kratzer and Hans Holbein worked together on a beautifully illustrated book about mathematical instruments which they gave to Henry VIII as a New Year's gift in 1528.