Possible Clues:

• Mid-11th-century year
• Mid-11th-century date
• 1,051, once
• Year in the reign of Leo IX
• Cato's 1,051
• Year in the reign of Macbeth, in Scottish history
• 1051, in old Tome
• CCX x V + I
• 1,051, to Nero
• Year in the life of William of Normandy