He caused shockwaves around the world when he was filmed apparently carving his name into a wall of Rome’s 2,000-year-old Colosseum – and grinning when he realized he was caught on camera.

According to legend, Rome was born on April 21, 753 B.C., when Romulus, the survivor of its feuding twin founders, hitched his plow and furrowed a circular perimeter in the hills above the Tiber ...