The papal tiara is a crown that was worn by popes of the Catholic Church from as early as the 8th century to the mid–20th century. ...
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It was last used by Pope Paul VI in 1963, and only at the beginning of his reign.
The name tiara refers to the entire headpiece, including the various crowns, circlets, and diadems that have adorned it through the ages, while the three-tiered form that it took in the 14th century is also called the triregnum or the triple crown, and sometimes as the triple tiara.
From 1143 to 1963, the papal tiara was solemnly placed on the pope´s head during a papal coronation. The surviving papal tiaras are all in the triple form, the oldest from 1572. A representation of the triregnum combined with two crossed keys of Saint Peter continues to be used as a symbol of the papacy and appears on papal documents, buildings and insignia, and on the flag of Vatican City.