The world's smallest army has one of its most eventful histories.

FACT — founded to protect a Renaissance pope

Julius II recruited Swiss mercenaries in 1506, drawing on their contemporary reputation as Europe's most disciplined soldiers.

FACT — the Sack of Rome, 1527: a last stand

When mutinous imperial troops sacked Rome, most of the Guard died holding the steps of St. Peter's so Clement VII could escape along the fortified Passetto di Borgo to Castel Sant'Angelo. New guards are still sworn in every May 6 in their memory.

MYTH — the uniform

Despite the popular story, no evidence connects the current uniform to Michelangelo. It was substantially redesigned in 1914 by Commander Jules Repond, drawing loosely on Renaissance-era paintings for inspiration.