Catholicism was introduced in Guam in 1668, after the Spanish conquest.
Until 1902 it was subject to the Philippine diocese of Cebu and afterwards to the
Apostolic Prefecture of the Mariana.
In 1911 it became a separate Apostolic Vicariate.
Vicars Apostolic
1911 - 1913 Francisco Javier Ricardo Villa y Mateu
Titular Bishop of Adraa in Arabia 18.. - 1913
1913 - 1914 Agustin José Bernaus y Serra, Titular
Bishop of Milopotamos in Kreta 1863 - 1930
1914 - 1934 Joaquin Felipe Oliaz y Zabalza, Titular
Bishop of Docimeum in Phrigia 1872 - 1945
1934 - 1945 Leon Angel Olano y Urteaga, Titular Bishop
of Lagina in Pamfilia II 1891 - 1979
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