This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
The Church Missionary Society sent its first missionaries to the court of Kabaka Mutesa I of Buganda in 1877, answering the explorer Henry Morton Stanley's published appeal of 1875 for missionaries to be sent there. Mutesa received the new arrivals, but rather than favouring them exclusively he played the Anglican, Catholic and Muslim factions competing for his court's attention against one another, a rivalry that went on to shape the region's religious and political history for decades afterward.
This mission is offered as one well documented case within a much broader nineteenth century expansion of Christianity across sub Saharan Africa, not as the whole of that expansion. The documentation itself carries a real bias worth naming honestly rather than passing over: missionary society records structurally foreground the European missionaries whose names and letters survive, over the African evangelists and catechists who in practice carried out much of the actual day to day work of spreading the faith, and whose own names are far less often recorded in the sources that remain.
What this changed for Christianity's spread was the planting, from a single royal appeal answered in 1877, of competing Christian missions inside an African kingdom's own court, a foothold that grew into an established presence in Buganda even as the historical record it left behind speaks far more fully for the missionaries who arrived than for the African Christians who did most of the work of establishing it.