One of the mysteries of the English language finally explained.
To the tombs of St Peter and St Paul in Rome, as a pilgrimage destination. Now frequently used with reference to the obligatory regular visits made to the Holy See by certain members of the Church hierarchy to report to the Pope.
Mid 17th century. From post-classical Latin ad limina apostolorum) from classical Latin ad + līmina, accusative plural of līmen threshold + post-classical Latin apostolorum, genitive plural of apostolus.
ad limina apostolorum/ˌad ˌlɪmɪnə əˌpɒstəˈlɔːrəm/
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