Infula

Webster's Dictionary

(n.) A sort of fillet worn by dignitaries, priests, and others among the ancient Romans. It was generally white.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

(otherwise called mitra, Στέφανος , Corona, Κίδαρις , Diadema, and Τίαρα , Tiara) is a cap worn, since the 16th century, by the bishops of the Roman Catholic and Greek churches, as one of the insignia of their episcopal office. (See Mitre).