Achilleus Kewanuka was a 19th-century Ugandan Catholic martyr who lived in the kingdom of Buganda. Born around 1869 into the Lugave clan, he served as a page and messenger in the court of King Mwanga II. After converting to Christianity through the influence of the Missionaries of Africa, he was baptized in late 1885. His refusal to renounce his faith led to his execution by the king, who viewed the growing Christian influence as a threat to his authority.