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.

The tourist who was filmed apparently carving his name into a wall of Rome’s 2,000-year-old Colosseum late last month has sent a letter of apology to the local prosecutor’s office, his defense ...