The Arthurian world associated with Celliwig is visible in Culhwch and Olwen, a Welsh tale whose hero needs help to win Olwen, daughter of Ysbaddaden. Culhwch approaches his kinsman Arthur and must first negotiate admission past the gatekeeper Glewlwyd Gafaelfawr, whose formidable reputation matches the extraordinary company within. The rules of entry and the conversation at the gate make the court a social institution, not simply a building. Once admitted, Culhwch explains his lineage and request. Arthur acknowledges their kinship and promises assistance, opening the wider quest to the resources of his household.

The Welsh Triads give Celliwig a further royal role. In the grouping of Arthur's principal seats, Celliwig in Cernyw appears with the king, Bishop Bytwini and Caradog Freichfras. The associated offices place religious and aristocratic authority beside Arthur's own leadership. These details belong to a literary arrangement of remembered names and relationships, not a contemporary administrative record. They also show why Celliwig should not be reduced to a discarded early spelling of Camelot: the Welsh court has its own setting, companions and traditions, preserved in texts whose forms and dates require careful distinction.

Another triadic episode presents the court as the scene of an outrage. Medrawd, the Welsh figure better known as Mordred, consumes the provisions at Arthur's court and strikes Gwenhwyfar, the queen known more widely as Guinevere. A retaliatory action by Arthur forms part of the same tradition. The episode reveals hostility within the Arthurian world, but it should not automatically be expanded into a complete explanation of Camlann. The brief notice does not by itself establish that this blow directly began the final war.

The name Celliwig has been interpreted in connection with a grove or wooded place, but an etymology does not prove that the court literally consisted of a throne beneath trees. Proposed identifications include Kelly Rounds, also called Castle Killibury, near Wadebridge; these are two names for the same hillfort, not separate candidates. Other suggestions connect the literary name with different Cornish or Welsh locations. Such proposals depend on combinations of names, geography and later interpretation. The existence of an ancient fort in a suitable landscape does not establish that Arthur held court there, and no single identification is adopted in this record.

Different Arthurian writers favour different centres. Geoffrey of Monmouth gives importance to places such as Caerleon, while Camelot becomes prominent in later romance. This difference does not demonstrate a deliberate erasure of Celliwig, nor should Geoffrey be credited with every court-name used by later French poets. The Cornish play Beunans Ke also preserves the form Kyllywyc, showing the name's life beyond the Welsh texts. Celliwig remains valuable precisely because it retains a particular literary identity. Its status is Legendary: a court known through tradition whose possible connection to a real place has not been securely demonstrated.