Denis Ssebuggwawo (Musajja-mukulu) was by tribe a Muganda from Bulemeezi county. His father was Kajansi and mother, Nsonga ( Musoga). Ssebuggwawo was from Edible or Cane Rat (Musu) clan - Thryonomys Swinderianus.
He was a page of king Muteesa I and a page in personal attendance of Kabaka Mwanga II.
Ssebuggwawo was baptized on 16th November 1885 by Pere Lourdel.
He was tortured and speared by king Mwanga II before handing him over to executioner Mpinga Kaloke on the evening of Tuesday 25th May 1886.
On Wednesday morning 26th May 1886, Mpinga ordered his two men; Matembe and Mulyowa to hack the boy of 16 years into pieces. Ssebuggwawo was first beheaded before he was hacked into pieces at Munyonyo.
He is the patron of choirs and musicians.
Monument built at the palce where St. Denis was speared