Akiga Sai (1898-1959) is heralded as one of the few indigenous African anthropologists and historians of the early twentieth century. His work for the Dutch Reformed Church in South Africa (DRCSA) as evangelist, teacher, and translator (1915-1945), however, is under-researched. Furthermore, despite the significance of Sai’s life and work, no biography of his life has been published. This article illustrates that it is possible to extract valuable biographical and contextual data regarding Sai from the records of the DRCSA Sudan Mission, demonstrating the collection’s value regarding early documentation of indigenous communities. By compiling a partial biographical profile of the Nigerian Tiv writer, politician, translator, and evangelist Akiga Sai as a case study, this article highlights the importance of the DRCSA’s archival collections, specifically the documentation relating to the Cape Synod’s Sub-Commission for Foreign Missions [Buitelandse Sending Subkommissie]. Part of the DRCSA’s heritage is its archive: the rich and varied sources, available in a wide variety of languages, contains valuable information about aspects of (Southern) African history unavailable elsewhere.