In 1967 Bishop Cyprian Kihangire began St John Bosco Seminary as a High School Seminary for Hoima Catholic Diocese. The seminary began humbly with only 13 boys joining year one of high school after having finished 7 years of elementary education. In 1978 Hoima Diocese witnessed the ordinations of the first priests who had passed through that seminary.
In 1979 Fr. Mujule was appointed Teacher and Dean of studies and Vocations Director at St John Bosco Seminary. Then In 1983- 84 was away for Master Degree in Education at University of Portland, Oregon, USA. In 1985-1990 Fr. Mujule was appointed the Rector of St John Bosco Seminary.
The 4th Bishop of Hoima Diocese, Rt Rev. Bishop VINCENT KIRABO had his Minor Seminary priestly formation at St John Bosco Seminary, 1969-1972. Thereafter he went to Alokolum National Major Seminary in Gulu, and then to Ggaba National Major Seminary in Kampala. He was Ordained a Priest on Sept, 9th, 1979. After his Priestly Ordination he was appointed Teacher and Dean of Studies at St John Bosco Seminary, and Diocesan Director of Vocations. Later on he went to University of Portland, Oregon, USA for Master's Degree in Education, (1988-1990)
A Book entitled - A HISTORY OF HOIMA DIOCESE PRIESTLY AND RELIGIOUS VOCATIONS" has been written by Rev. Fr. Agaptus Hector Businge of Hoima Diocese. The book he has written shows the growth of Priestly vocations in Hoima Diocese. And the book was published in time to mark Hoima Diocese Golden Jubilee - August 9, 1965 - August 2015