Nightbringer | The Arthurian Online Encyclopedia

Messur y Peir

“Measure of the Cauldron”

In Culhwch and Olwen, the name Messur y Peir was bestowed upon the harbor formerly called Porth Cerddin after Arthur and his warriors, returning from their invasion of Ireland bearing an enchanted cauldron, landed there.


Source
Culhwch and Olwen | Late 11th century