André Vingt-Trois, former Archbishop of Paris, is the cardinal priest of San Luigi dei Francesi (St. Louis, King of France). Cardinal deacons In the wider sense, the term titular church is also loosely applied to the deaconries in Rome assigned to the cardinal-deacons. Originally, a deaconry was a charitable institution in Christian Rome, first mentioned in connection with Pope Benedict II (684–685). It would seem that in an early period there were seven deaconries, each corresponding to one of the seven divisions of the city. As the terms implies, each was entrusted to a deacon. Pope Adrian I (772–795) fixed their number at 18, a number that remained constant until the 16th century. Since the medieval period, men appointed cardinal deacons are often holders of high office in the Roman Curia. However, there have also been some recent developments since it was established that cardinals over the age of 80 would not participate in the conclave that elects a new Pope. Despite this new rule, the Popes have continued to appoint as cardinals a limited number of priests or bishops who have already reached 80 years of age. Often such men are assigned to the order of cardinal deacons. Among the cases that may arise are those of a bishop or archbishop who is widely esteemed but is not made a cardinal for some specific (though rarely publicly announced) reason. It may be, for example, that such a appointment, given while he is under the age of 80, would increase in a disproportionate way the number of cardinals from a single country eligible to participate in the next conclave, or else it would risk creating an expectation that his successors will in future necessarily be made cardinals, too. In other cases, it has become the custom for the Pope to appoint from time to time as cardinals a small number of highly regarded theologians who have already reached the age of 80. Often in these cases, the rank assigned has been that of cardinal deacon. There is also a practice of changing the rank of the cardinalatial church from deaconry to priestly title or vice versa, permanently or, as the phrase goes, pro hac vice (for this turn). For instance, a man appointed a cardinal deacon will by definition be assigned a church that has the rank of a "deaconry". It is customary for a cardinal deacon, after ten years,