The most important room in a castle was the Great Hall. This is where all the members of the household sat down to eat at tables set up for every meal. It was where feasts were held for special days, or when there were guests. King Arthur's Pentecost Feast takes place in such a Hall.

In the architecture of a medieval castle, the Great Hall was the premier multifunctional hub, serving as the center for dining, judicial proceedings, and social gatherings. It was a high-value space where the lord demonstrated his power through grand banquets. Another critical area was the Keep (or Donjon), the strongest, most fortified tower designed as a final refuge during a siege. The Kitchens were equally vital, often located in separate buildings to prevent fire from spreading to the main residence; they were the high-intensity engine behind the castle's hospitality. Additionally, the Solar provided a rare "private" sanctuary for the noble family to escape the bustle of the hall, while the Chapel added high-quality prestige and spiritual protection, reinforcing the castle's status as a central pillar of the local community and feudal authority.