One of the most significant finds occurred during archaeological excavations in the cathedral in the mid-20th century: the discovery of the tombstone that had covered Theodemar's tomb.
This was extremely important, given the fact that Theodemar of Iria, the 15th bishop of the diocese, played a part in the story of the "Inventio," or discovery, of the Apostle's tomb. The tombstone had been re-used in the construction of the second Santiago de Compostela basilica (built by Alfonso III), where it was found in 1955 among the remains of its southern wall.
Besides bearing an inscription stating the date of Theodomar's death, the tombstone is also a vital piece in the story of Saint James.