King Beli the Great, son of Manogan, was blessed with four sons. The eldest was Lludd, and he was followed by Caswallawn, Nyniaw and lastly, Llefelys.

On the day of his father's sad passing, Lludd became the King of the Island of Britain. Lludd was a generous King, blessing his followers with meat and drink, inspiring them in battle. Of all his many castles and cities, he loved London best. In those times, it was called Caer Lludd, as he rebuilt the city walls and built splendid houses there.

Word came to Britain that the King of France had died, leaving his dominion in the hands of his daughter. Llefelys came to Lludd and asked that he might seek the hand of this Queen, so that the honour and status of their family might increase. Of all his brothers, Lludd loved Llefelys the most, and valued his wisdom. So he readily agreed to his proposal.

Llefelys set sail as soon as his ships were ready, and sent messengers to the Queen and to the French noblemen on his arrival as to his purpose. He married the Queen, and though their wedding was a political match, they lived happily enough. Llefelys proved to be a wise and prudent King.

One day, word arrived in France of three mysterious plagues that had befallen the Island of Britain.

A strange people called the Coranieid had arrived there, possessed of mysterious powers. They were great magicians, and whatever words were spoken on the Island, they would hear, no matter how quietly they were spoken. The wind carried all words straight to their ears. No harm could be done to them, no plots made against them without their knowledge.

The second plague was a horrible scream that was heard every Bealtinne over every hearth in Britain. The scream was so terrible that men lost their strength on hearing it and women miscarried their children. All the land was laid to waste, and many people fell into madness.

The third plague struck at Lludd himself. Of all the food prepared in his court, even were it a full years worth of provisions, it could only be enjoyed on the first night of it's preparation.

As the first plague had a cause, Lludd held out hope of winning deliverance from it. But he had no idea of how he should rid his land of the other plagues, being mysterious in their origin. And so, he and his nobles decided that they must ask Llefelys for his advice. In silence, they prepared a fleet. No-one spoke one word of their journey, lest the Coranieid discover their plan.

As they approached the shore of France, they found Llefelys waiting there with a great army. For he had no word of their coming and feared the nature of the approaching fleet. When he realised that his brother Lludd was in one of the boats, he sent his army away, and went out into the waters to greet his beloved brother.

Once Llefelys had been told of the Coranieid, he produced a long horn of bronze. Through this, he and Lludd might converse without the wind taking their voices to their enemies. However, unbeknown to Llefelys, a demon had taken up residence inside the horn. Every sentence spoken into it was relayed falsely to the listener, so that the two brothers might have come to blows were it not for the wisdom of Llefelys and the love between them. The demon was washed out of the horn, and once their talk was unhindered, the brothers began to make plans.

Llefelys gave Lludd some insects. He advised his brother to use the insects, but to keep some alive in order that they should breed, affording Lludd a ready supply of the insects should they be needed. The insects, mashed with water would be effective against the Coranieid. Llefelys instructed Lludd to call a council between his people and the Coranieid in pretence of peace. Once the Coranieid were assembled, Lludd was to sprinkle the water containing the mashed insects upon the assembly. His own people would be unharmed, but the mixture would be deadly poison to his enemies.

"The second plague," said Llefelys, "is caused by two fighting dragons. In your land dwells a dragon, which is being set upon by the dragon of a neighbouring people. Your dragon screams in defiance. This is what you must do to stop the screaming. Measure the Island of Britain, so that you might find it's exact point of centre. In that place, dig a pit, in which you must place a tub of fine mead. Cover the mead with a silken cloth. At night, keep watch for the dragons. You will see them fighting in the sky, monstrous in form. After they have wearied of their combat, they will take the form of pigs, and fall to the earth, onto the silk cloth. There, they will drink the mead and fall asleep. Quickly, before they awaken, wrap them in the silk and bury them in a stone coffer deep down in the earth. As long as they remain undisturbed, no more plagues will visit the island of Britain."

"The third plague is caused by a great enchanter. He casts a spell so that all fall asleep, after which he carries off your meat and drink. To prevent this, you yourself must keep watch over the food. Keep a tub of cold water at your hand, so that when sleep begins to overcome you, you can climb within. This will prevent you from falling asleep."

With his brothers blessing, Lludd returned to Britain and did as Llefelys had advised him. The Coranieid were easily overcome with the help of the insects, and the whole of their race was destroyed without harm to the Britons.

As Llefelys had instructed him, Lludd had the Island of Britain measured, and he found it's centre in Oxford. There, he ordered the pit dug, the mead set within, and the silken cloth covering these things. As night fell, he settled down to keep watch, and sure enough, as the moon rose, he saw the two dragons engaged in bitter battle. As wise Llefelys had predicted, the dragons grew weary, sank onto the cloth, drank the mead and fell asleep. Lludd had them buried in a stone coffer in the safest place in Eryri. This place was known thereafter as Dinas Emreis, and had previously been known as Dinas Ffaraon Dandde. It was called for a man of that name, one of the Three Noble Youths, who broke their hearts with consternation. And so ended the terrible screaming that had laid the land to waste.

In celebration, Lludd ordered a great feast, well aware that the magician Llefelys had spoken of might pay a visit. So, he had prepared a bath of cold water, and set himself to keep watch over the party. While he waited, clad still in his armour, late into the night, he heard a strange and wonderful music that compelled him to sleep. Feeling drowsy, he stepped into his bath, the shock of the water rousing his senses. And what did he see? A huge giant of a man stepped into the room, collecting all the meat and drink into a big hamper that he carried with him. Lludd was amazed at the amount of food that the hamper would carry. The giant left the room, but Lludd ran after him. "Stop there! You have done me much wrong, and shall do me no more, unless you prove yourself greater than myself at arms!" There followed a furious contest between the two men, who were almost equal in strength and skill. At length, through the will of fate, Lludd cast the giant to the ground, where he begged for quarter. Lludd was loath to grant quarter after the great wrongs that the giant had done him. Yet, the giant promised to make good the provisions that he had stolen, and to be his leige man from then forth.

And in this way, Lludd rid the Island of Britain of the Three Plagues. From then on, he ruled in prosperity and peace.