Gorsedd Arberth, the mound above Pwyll’s palace at Narberth, is a threshold between the court’s ordinary life and the uncanny. Its stated rule promises a wonder or wounds to anyone who sits upon it, and the episodes staged there bear out the first possibility: the mound becomes the place where Pwyll encounters Rhiannon and where later marvels draw Pryderi and Manawyddan into danger.

Setting and Reputation

A member of Pwyll’s court describes the mound as peculiar: no one may sit there and leave without either receiving blows or wounds, or seeing a wonder. Pwyll accepts the risk, reasoning that he is surrounded by a great company and would gladly witness a marvel. The setting is thus introduced not simply as elevated ground above the palace, but as a place whose customary effect shapes what its visitors expect to happen.

The episodes that follow repeatedly return to the mound as a vantage point and a point of encounter. Its position above the palace connects the royal household to events that cannot be managed by ordinary courtly means, while the promise attached to sitting there gives those events a shared frame.

Pwyll’s Encounters with Rhiannon

While Pwyll sits on the mound, a lady in shining gold rides toward him on a large white horse. A courtier on foot cannot catch her; the swiftest horse sent after her fares no better. On the following day, another rider tries, first at an amble and then at full speed, but the lady remains at the same distance despite appearing to travel at an even, unhurried pace. The repeated failure turns the road beside the mound into a scene of impossible pursuit.

On the third day Pwyll rides after her himself. When he calls on her to stop, she agrees and points out that he could have asked sooner, since the effort is exhausting his horse. She reveals that she is Rhiannon, daughter of Heveydd Hen, and that she came seeking Pwyll because she loves him and refuses a husband chosen against her will. The mound’s wonder is therefore also an encounter that alters the course of Pwyll’s personal life: what began as a test of pursuit becomes a declaration and a request for his answer.

The Enchanted Castle and Pryderi’s Disappearance

Later, while hunting, Pryderi and Manawyddan follow a white boar to a vast, newly built castle in a place where they had never seen any building. The dogs rush inside after the animal and vanish from hearing. From the top of Gorsedd Arberth, the men look and listen for them but hear nothing. The mound serves here as a lookout over an uncanny appearance, but observation cannot resolve the mystery.

Pryderi rejects Manawyddan’s warning that a spell has brought the castle into being and enters to find his dogs. Inside, he sees no people, animals, or dwelling; at the centre of the floor stands a fountain surrounded by marble, with a golden bowl on a marble slab and chains hanging from above. When he takes hold of the bowl, his hands stick to it and his feet to the slab, leaving him unable to speak. The episode extends the mound’s association with marvels into a perilous encounter beyond its height: seeing the wonder does not mean remaining safe from it.

Later Use and Narrative Significance

The mound returns as a place of action when Manawyddan takes a mouse he has caught to the highest part of Gorsedd Arberth and sets up two forks, intending to hang it. The moment recalls the site’s earlier association with marvels, but this time the extraordinary circumstance arrives in the form of a shabby scholar who approaches as Manawyddan prepares his punishment. The account notes that seven years have passed without his seeing people or animals there, apart from the four companions who had remained together before two were lost.

Across these episodes, Gorsedd Arberth gathers different forms of the uncanny without reducing them to a single spectacle: an uncatchable rider stops at Pwyll’s request, an unseen enchantment manifests as a castle and a trapping bowl, and a seemingly ordinary mouse becomes the occasion for a stranger’s intervention. The mound’s narrative force lies in this recurrence. It marks a place where the boundaries between courtly space and marvel are repeatedly crossed, while leaving the consequences to unfold beyond the mound itself.