Possible Clues:

• 1003, in old Rome
• Early 11th-century date
• 1003, to Tiberius
• 1,003, in Roman numerals
• 1,003 in Roman numerals
• 1003, in Roman numerals
• Livy's 1,003
• Post-millennium "annum"
• The year 1003
• D + DX - VII