Diocese of Santa Maria di Grottaferrata

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Byzantine (Italo-Albanian) rite territorial abbey near Rome, founded in 1004 by Saint Nilus of Rossano and immediately subject to the Holy See (not Latin rite as commonly listed). After a long vacancy, Manuel Nin Güell, O.S.B., was appointed in January 2026 to oversee it.

Apostolic Administrator
Manuel Nin Güell
Latin name
B. Mariae Cryptaeferratae
Erected
26 September 1937 (origins 1004)
Cathedral
Abbey Church of Santa Maria di Grottaferrata (Abbazia di San Nilo)
Patron
Saint Nilus of Rossano
Rank
Abbazia Territoriale Immediatamente Soggetta Alla S.s.
Rite
Latin
Province
Immediately subject to the Holy See
Catholics
9
Chancery
Monastero Esarchico di Santa Maria, Corso del Popolo 128, 00046 Grottaferrata [Roma], Italia
Telephone
Tel. 06.94.59.309; fax 06.94.56.734

Contact as printed in the Annuario Pontificio.

Sources: official site + Wikipedia (it) + Silere Non Possum · Annuario code 001000305 · ontology v0.3.2 · updated 2026-06-08

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