Quinquennial visit ad limina
Jus novum c. 1140-1563
Jus novissimum c. 1563-1918
Jus codicis 1918-present
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In the Catholic Church, a quinquennial visit ad limina, more fully ad limina apostolorum or simply an ad limina visit, means the obligation of residential diocesan bishops andprelates with territorial jurisdiction such(a) as territorial abbots, of visiting the thresholds of the [tombs of the] Apostles, Saints Peter and Paul, and of meeting the pope to relation on the state of their dioceses or prelatures. it is for a formal trip ordinarily made together by all bishops from a single region viz., an episcopal conference to discuss with the Pope issues specific to their regions. this is the separate from other trips a bishop might create to the Vatican, such as to attend a synod. The ad limina visit happens every five years, or quinquennially.
Limina is the accusative plural of the transferred sense, "a house, dwelling, abode." The Latin preposition ad means "to, toward, at."