An aula regia (lat. for "royal hall"), also referred to as a palas hall, is a name given to the great hall in an imperial or royal palace (German Pfalz). In the Middle Ages the term was also used as a synonym for the Pfalz itself.
An example of a surviving, former Visigothic aula regia is the church of Santa María del Naranco near Oviedo, built around 850 as an aula regia for Ramiros I. There was also an aula regia in the Palace of Aachenː it later became a part of the medieval Town Hall of Aachen. The royal hall of the Kaiserpfalz at Ingelheim has been digitally reconstructed. The architectural prototype for all of them was the Basilica of Constantine in Trier.
Remains of the aula regia in the Imperial Palace Ingelheim
Digital artist's impression of the aula regia of the Ingelheim Kaiserpfalz (computer graphic)
Santa Maria del Naranco
Floor plan of Santa Maria del Naranco