Messur y Peir

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A harbor in Dyfed that was home of Arthur’s warrior Llwyd.

Arthur and his soldiers landed here upon returning from their invasion of Ireland. They bore the enchanted cauldron of Diwrnach, and the port was renamed Messur y Peir (“Measure of the Cauldron”) in honor of the event.

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Notes
Porth probably derived from the Latin porta, a passage-way, a gate, an opening.

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Source
Culhwch and Olwen | Late 11th century