Lludd

Three troubles fall on Britain during Lludd's prosperous rule. The Coranians can hear any conversation carried by the wind, making them difficult to oppose. Every May Eve, a shriek passes over the island, terrifying people and leaving children, animals, trees and crops barren. Food prepared in the king's courts also disappears during the first night, however large the stores may be. Lludd gathers his nobles, then sails in secret to ask his brother Llefelys, now king in France, for counsel. The brothers meet at sea and speak through a brass horn, after wine drives out a demon that had twisted their words into hostile noise.

Llefelys gives Lludd insects: some are kept for breeding, while others are crushed into water. At a gathering called to make peace, Lludd throws the mixture over Britons and Coranians alike; it destroys the Coranians without harming his own people. For the May Eve shriek, Llefelys explains that two dragons are fighting beneath the island. Lludd measures Britain, finds its centre at Oxford, and sets a cauldron of mead beneath a satin covering. The dragons descend as pigs, drink and sleep. Lludd wraps them in the covering and buries them in a stone chest at Snowdon, at the place later called Dinas Emrys. To stop the thefts, he watches a banquet with a cauldron of cold water beside him, plunging into it whenever sleep presses on him. A huge armed magician arrives with a hamper and packs in the food. Lludd challenges and defeats him; the thief agrees to repay every loss and become Lludd's vassal. Britain is free of all three plagues, and Lludd rules in peace for the rest of his life.