- Confessio gallicana (1559).
Confessio belgica (1561).
In 1562 the Confessio belgica was publicly acknowledged, and in 1563 the church order was arranged.
Cesareo; this is a marble altar richly decorated with mosaic in sculptured panels, and (below) two angels drawing back a curtain (all in marble) so as to expose the open grating of the confessio.
The eastern crypt, or confessio, extends under the whole of the choir and has three apses, like the upper church.