He was the first African to receive the honour of knighthood.
Mary, who is now 94 years old, is the granddaughter of Sir Apolo Kaggwa who was a Katikkiro (Prime Minister) in the Buganda Government, and is the daughter of Mary and Sepiriya Kaddumukasa.
Chesswas cites Sir Apolo Kagwa's Engero z’Abaganda and Michael B. Nsimbi's Olulimi Olugand as his major sources, and acknowledges Nsimbi as his primary aid in developing the text.