Hirth made Kashozi his Episcopal See. He later moved to
Rubya, where he founded a seminary, and was personally involved in training future priests for Bukoba and Rwanda.
Joseph Sweens was appointed
coadjutor bishop to Hirth on 17 December 1909. He reached South Nyanza in April 1910. Hirth returned to his old residence at
Kashozi, leaving Sweens to live at the seminary of
Rubya. For the next three years Sweens visited the different stations of the diocese, resolved problems and represented the diocese to the civil authorities. In 1912 the missions of Burundi, formerly part of the Vicariate of Unyanyembe, were joined with the missions of
Rwanda to form the new
Apostolic Vicariate of Kivu, with Hirth as the first Vicar Apostolic. South Nyanza now consisted only of the regions of
Bukoba and
Mwanza to the south of
Lake Victoria. On 12 December 1912 Sweens succeeded Hirth as Vicar Apostolic of South Nyanza. On 15 January 1915 the territory was renamed the Vicariate Apostolic of Victoria-Nyanza. In April 1929 the vicariate was divided into two more manageable units, the vicariates of
Bukoba and
Mwanza. ==References==