The Iron Crown is a reliquary votive crown, traditionally considered one of the oldest royal insignia of Christendom. It was made in the Middle Ages, consisting of a circlet of gold and jewels fitted around a central silver band, which tradition held to be made of iron beaten out of a nail of the True Cross. In the later Middle Ages, the crown came to be seen as a heritage from the Kingdom of the Lombards and was used as regalia for the coronation of some Holy Roman Emperors as kings of Italy. It is kept in the Duomo of Monza.

The Kingdom of the Lombards, also known as the Lombard Kingdom and later as the Kingdom of all Italy, was an early medieval state established by the Lombards, a Germanic people, on the Italian Peninsula in the latter part of the 6th century. The king was traditionally elected by the very highest-ranking aristocrats, the dukes, as several attempts to establish a hereditary dynasty failed. The kingdom was subdivided into a varying number of duchies, ruled by semi-autonomous dukes, which were in turn subdivided into gastaldates at the municipal level. The capital of the kingdom and the center of its political life was Pavia in the modern northern Italian region of Lombardy.