Tuzinde was a Muganda of the Colonbas monkey (Nkima) clan, his father was Katamiiza Mukajanga, the chief executioner of the lung fish clan was his uncle by pact. Tuzinde’s mother was Bakuwamumanyi of the Yam fruit (Kkobe) Clan.

Tuzinde was born in 1869 at Luyonga (Limuli) village bear Naddangira parish in Busiro County. He grew up with his parents, but at the age of 14, Tuzinde was taken to his uncle Mukaajanga who selected him to go to the palace of Mwanga as a page.

At the palace, Tuzinde served as a page in the audience hall in charge of the food for the visitors. One day in a jocking way, some friends demanded for meat from him and he answered “Mbaaga?” (I am slaughtering). Hence he was nicknamed Mbaaga.

Mbaaga soon became interested in the Catholic Faith due to the good examples of the Catholic pages. He was instructed by his leader Charles Lwanga.

When the Christian persecution broke out, Mbaaga played a very heroic part in defence of his vocation against his uncle Mukaajanga right from the beginning to the end. His relatives did their best to make the boy deny the religion in order to save his life, but failed at Namugongo.

Mbaaga spent a week with his relatives forcing to deny his religion. Despite the promises and tortures for a whole week and nights they failed. At the Namugongo furnance, Mukaajanga tried the last time. The boy was hit on the head and his body was thrown on the pyre of Namugongo, where it was burnt to ashes for Christ on Thursday noon 3^rd June, 1886.

Mbaaga is the patron of vocations mainly of the seminarians, aspirants, postulants and novices.