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The Iron Crown of Lombardy
A precious symbol of Italian royalty, the Iron Crown was made in 591. The interior ring was purportedly forged from the metal of one of the nails from the True Cross, discovered by St. Helena. Kings ranging from Charlemagne to Ferdinand I of Austria, including Charles V and Napoleon along the way, wore this crown in their day.

© James Steakley | Wikipedia | CC BY-SA 3.0