text: The geometry of the plan chosen was very simple: Odo of Metz decided to keep the layout of the Roman roads and inscribe the square in 360 Carolingian feet, or 120 metres-side square. The square enclosed an area of 50 acres divided in four parts by a North-South axis (the stone gallery) and an East-West axis (the former Roman road, the decumanus). To the north of this square lay the council hall, to the south the Palatine Chapel. The architect drew a triangle toward the East to connect the thermae to the palace complex. The two best-known buildings are the council hall (today disappeared) and the Palatine Chapel, included into the Cathedral. The other buildings are hardly identified. Often built in timber framing, made of wood and brick, they have been destroyed. Lastly, the palace complex was surrounded with a wall.
  The arrival of the court in Aachen and the construction work stimulated the activity in the city that experienced growth in the late 8th century and the early 9th century, as craftsmen, traders and shopkeepers had settled near the court. Some important ones lived in houses inside the city. The members of the Palace Academy and Charlemagne's advisors such as Eginhard and Angilbert owned houses near the palace.
  Council Hall
  Located at the North of the Palace complex, the great Council Hall (aula regia or aula palatina in Latin) was used to house the speeches delivered by the Emperor once a year. This occasion gathered the highest officials in the Carolingian Empire, dignitaries and the hierarchy of the power: counts, vassals of the king, bishops and abbots. The general assembly was usually held in May. Participants discussed important political and legal affairs. Capitularies, written by amanuenses of the Aachen chancellery, summed up the decisions taken. In this building also took place official ceremonies and the reception of embassies. Describing the coronation of Louis, son of Charlemagne, Ermold the Black states that there Charlemagne "spoke down from his golden seat."