Around 1150 a porch was added in front of the north portal of the church, which remains the only part of the church preserved to this day. The former north door of the cathedral is now the back wall of the porch. The front of the lobby is decorated with two rows of niches with plaster sculptures that were originally coloured. The top row portrays Madonna with child in the middle, surrounded on both sides by chandeliers and angels, the original figures of angels having been lost and replaced by paintings. The bottom row shows, from left to right, Emperor Henry III, the patron saint of the cathedral, Simon, Matthew and Jude, as well as another, not clearly identifiable, imperial figure.
