Holy Roman Emperor, Charles V was born on this day (February 24) in 1500. Charles was the preeminent ruler in Europe, with influence extending far beyond the Empire. Hey, he owned the Western Hemisphere (minus Brazil).
When Henry VIII wanted to annul his marriage to Catherine of Aragon, he ultimately had to deal with Charles, who was holding the pope captive at the time. Martin Luther and the reformers had a fun time with him as well!
BTW, take note of the Habsburg chin.