1910 New Catholic Dictionary
Iron Crown of Lombardy
Legendary diadem of Constantine preserved at Monza, consisting of an inner iron band six inches in diameter, enclosed in a circlet of six plates of gold, richly decorated with jewels and enamel. The iron band is said to be made from a nail of the Holy Cross.
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Entry for 'Iron Crown of Lombardy'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/i/iron-crown-of-lombardy.html. 1910.