The Roman Catholic Church is the world's largest Christian Church, and its largest religious grouping. There are an estimated 17 million baptised Catholics in Nigeria, some 15% of the population.
Nigeria, together with Congo Democratic Republic, boasts of the highest number of priests in Africa. The boom in vocation to the priesthood in Nigeria is mainly in the eastern part (especially among the Igbo ethnic group) which accounts for over 70 percent of the country's Catholic population.
The second papal visit to the country in 1998 witnessed the beatification of Blessed Cyprian Michael Iwene Tansi. Pope John Paul II proclaimed him blessed at Oba, Onitsha Archdiocese, a local Church established by the apostle of eastern Nigerian, Bishop Shanahan.
Within Nigeria the hierarchy consists of: