Possible Clues:

• 1,054 in Old Rome
• Roman 1054
• 1054, in Roman numerals
• 1054, to Hadrian
• XII years before the Battle of Hastings
• LXII x XVII
• MMMMMMMMMMMMMMMMMMMMMLXXX/XX
• 1054, to Caesar
• 12 years before the Norman Conquest
• Year in Edward the Confessor's reign