Lludd and Llefelys

It tells of the Welsh hero Lludd Llaw Eraint, best known as King Lud son of Heli in Geoffrey of Monmouth's Historia Regum Britanniae, and his brother Llefelys.

[2] With the aid of a brass horn that prevents the Coraniaid from hearing their conversation, Llefelys offers solutions to each plague.

Lludd must set a trap for them at the exact centre of the island called Oxford, put them to sleep with mead, and then bury them underground in a stone chest.

The third plague is caused by a "mighty magician", who casts a spell to make the whole court fall asleep while he raids their stores.

[3] The earliest versions of the story appear inserted into certain manuscripts of the Brut y Brenhinedd, a series of Welsh adaptations of Geoffrey of Monmouth's Historia Regum Britanniae.

[1] Historia chapters 40–42 contain a narrative in which the tyrant Vortigern attempts to build a citadel, but the structure collapses repeatedly.

The kingdom is beset by oppressors, and as in the story of Lludd, both fertility and the food supply is affected, but Lugh returns and saves his people with his wit and skills.