The two religious congregations, the Sons of the Sacred Heart and the Pious Mothers of Nigritia, furnished missionaries and sisters to the vicariate, and the two periodical papers La Nigrizia (The Africaness, in Verona, Italy) and Stern der Neger ('Star of the Africans', in Brixen, then imperial Austria) print articles about this mission. The number of inhabitants is uncertain, perhaps about eight millions. Missionary work was limited to the southern and animist part of the Anglo-Egyptian Sudan (primarily now in South Sudan) with the Shillouki Dinka, Nuer, Jur, Golo, Nyam Nyam and other Nilotic tribes.