[2] It contains the relics of Cyprian Iwene Tansi, as well as the tombs of Bishop Joseph Shanahan and Archbishops Charles Heerey, Stephen Ezeanya and Albert Obiefuna.

Till 1930 what served as the central place of worship for the vicariate was the dual purpose building erected in 1914,the present holy Trinity primary school.

The post war reconstruction happened to collide with the early period of the recommendations of the Vatican ll council especially regarding the liturgy.

An indisputably unique treasure in the cathedral is the relics of Blessed Michael Cyprian Iwene Tansi who was beatified by Pope John Paul II in 1998.

Holy Trinity cathedral was elevated and promoted to a minor Basilica by Pope Benedict XVI on 28 May 2007 under the episcopacy of Archbishop Valerian Maduka Okeke.