Cardinal Francis Arinze looks over his balcony on to St Peter’s Square, golden in the blazing sunshine. It’s so hot and humid, in fact, that we go back inside and sit down near a colourful tapestry of Blessed Cyprian Tansi which almost covers one of the walls.

The cardinal turns 90 this year but looks and sounds at least 20 years younger. He speaks about Blessed Cyprian, pointing out that his fellow Nigerian priest received him into the faith as a nine-year-old boy and offered him an example of great holiness which has endured for a lifetime.