The ad limina visit refers to the obligatory visit, every five years, by the ordinaries (bishops) of dioceses to the Holy See. It takes its name from the ancient practice of pilgrimages ad limina apostolorum—to the thresholds (or tombs) of Sts Peter and Paul in Rome.
Fr John Persaud, AEC Secretary told Catholic News via e-mail that the bishops will arrive April 14 and are required to present a report about their respective dioceses when they meet with the pope April 16.