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".
Origin
Mid 16th century.
Definition of Iron Crown in US 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".