Definition of Iron Crown in English:

Iron Crown

noun

  • A small jewel-encrusted gold crown with which the kings and queens of Lombardy (and later Italy) were crowned; frequently in "the Iron Crown of Lombardy", "the Iron Crown of the Lombards".

    The Iron Crown, which is held in the cathedral church of Monza, is so called from the inner band of iron it contains, reputed to be made from a nail used in the crucifixion of Jesus.

Origin

Mid 16th century.