Abstract This article extends the history of freed slaves from the well-studied areas of West Africa to the frontier between Angola and Belgian Congo. Originally enslaved by Ovimbundu traders in what became south-eastern Belgian Congo, these enslaved people became Christians through contact with Euro-American missions while labouring in Angola. Following the abolition of slavery in the Portuguese Empire in the 1910s, they returned to their home areas as Christian evangelists. In Belgian Congo, they helped to spread Christianity but clashed with missionaries over authority and respectability. Some struggled with the trauma of enslavement while others sought alternative routes to status and authority through participating in Independent Christian movements or assuming positions of traditional leadership.