Lay cardinal
Layman appointed as a Catholic cardinal
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In the historical practice of the Catholic Church, a lay cardinal was a man whom the Pope appointed to the College of Cardinals while still a layman. This appointment carried with it the obligation to be ordained to a clerical order,[1] meaning that "lay cardinal" was not a permanent state, but a term in reference to a man who was appointed cardinal prior to taking on the clerical state corresponding to that appointment.[2]

The current law of the Catholic Church is that a man must be first ordained at least a priest in order to be considered for appointment as a cardinal.[3]
List of laymen who were created cardinals
| Name | Year created cardinal | Highest clerical order received |
|---|---|---|
| Pope Paul III | 1493 | Pope |
| Pope Leo X | 1489 | Pope |
| Charles Borromeo | 1560 | Archbishop |
| Ferdinando I de' Medici | 1562 | Minor orders[4] |
| Maurice of Savoy | 1607 | Minor orders[4] |
| Francisco Gómez Rojas de Sandoval | 1618[5] | Priest[6] |
| Ferdinand of Austria | 1620 | Minor orders[7] |
| Giulio Raimondo Mazzarino | 1641 | Minor orders |
| Marino Carafa di Belvedere | 1801 | Resigned before being ordained[8][9] |
| Teodolfo Mertel | 1858 | Deacon[10] |
Discontinuation
In 1917, Pope Benedict XV promulgated the first edition of the Code of Canon Law, which included a provision that a man must be first ordained a priest prior to being considered for appointment as a cardinal.[11]
According to The New York Times, Pope Paul VI considered making the French Catholic philosopher Jacques Maritain a cardinal in 1965.[12]