[1] This became the Apostolic Vicariate of Northern Japan in 1876 and then was suppressed in 1891 to establish the Archdiocese of Tokyo.

[1] On November 11, 1937, the Diocese of Yokohama was erected out of territory of the Archdiocese of Tokyo.

The new diocese covered eight prefectures of Japan: Kanagawa, Ibaraki, Tochigi, Gumma, Saitama, Yamanashi, Nagano and Shizuoka.

On January 4, 1939, four of those prefectures – Saitama, Ibaraki, Tochigi and Gumma – were moved to the newly formed Apostolic Prefecture of Urawa, now the Roman Catholic Diocese of Saitama.

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