John Francis McCormack, KSG, KSS, KHS, was an Irish lyric tenor celebrated for his performances of the operatic and popular song repertoires, and renowned for his diction and breath control. He was also a Papal Count. McCormack became a naturalised American citizen before returning to live in Ireland.

The papal nobility are the aristocracy of the Holy See, composed of persons holding titles bestowed by the Pope. From the Middle Ages into the nineteenth century, the papacy held direct temporal power in the Papal States, and many titles of papal nobility were derived from fiefs with territorial privileges attached. During this time, the Pope also bestowed ancient civic titles such as patrician. Today, the Pope still exercises authority to grant titles with territorial designations, although these are purely nominal and the privileges enjoyed by the holders pertain to styles of address and heraldry. Additionally, the Pope grants personal and familial titles that carry no territorial designation. Their titles being merely honorific, the modern papal nobility includes descendants of ancient Roman families as well as notable Catholics from many countries. All pontifical noble titles are within the personal gift of the pontiff, and are not recorded in the Official Acts of the Holy See.