The medieval stables once served as an armory for weapons and a shelter for horses.
The name "Marstall" goes back to a Renaissance building on the south side of the courtyard, which was destroyed in 1693 and built by Count Palatine Johann Casimir built in 1590. Today, the Marstall complex - one of Heidelberg's few surviving buildings from the late Middle Ages - has been rebuilt several times and houses the central cafeteria hall in the Old Town, as well as event rooms and the administration of the Student Union.