In 1894 the diocese was split into Southern Nyanza, south and west of Lake Victoria, an eastern portion called "Upper Nile" that was given to the English Mill Hill Missionaries,
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The Catholic Encyclopedia of 1912 said the vicariate had about 2,500,000 pagans, 7,000 Catholics, 12,000 catechumens, 30 White Fathers; 23 lay brothers and six Missionary Sisters of Notre-Dame-d'Afrique.
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Hirth established himself at Kabgayi and worked with the Rwandan seminarists there until his retirement in 1921.
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Bishop John Joseph Hirth took the Apostolic Vicariate of Southern Nyanza, the English Mill Hill Missionaries took the eastern part, called the Apostolic Vicariate of Upper Nile, and Antonin Guillermain was assigned the western part, called the Apostolic Vicariate of Northern Nyanza.