Author claims archive documents show Christ the Saviour bust was one of the artist’s secret works

Fabio Orazzo should have been on his way home to Naples for the weekend. Instead, curiosity kept him in Rome, where he teaches art and history, long enough to jump on a bus to visit a little-known church in the north-east of the Italian capital.

He came to Sant’Agnese fuori le mura (St Agnes Outside the Walls), built above fourth-century catacombs, to see a marble bust depicting Christ the Saviour. A fixture in the church since 1590, it has been thrust into the spotlight by the bold claim that it could have been sculpted by Michelangelo.