Here is a full story MATH THE SON OF MATHONWY link
http://www.sacred-texts.com/neu/celt/mab/mab26.htm
Copy of an extract that contains the creation of Blodeuwedd and consequent story.
Many a youth might have lost his life through the
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uproar thou hast caused in this Cantrev to-day. Now will I lay a destiny upon this youth," she said, "that he shall never have a wife of the race that now inhabits this earth." "Verily," said he, "thou wast ever a malicious woman, and no one ought to support thee. A wife shall he have notwithstanding."
They went thereupon unto Math the son of Mathonwy, and complained unto him most bitterly of Arianrod. Gwydion showed him also how he had procured arms for the youth. "Well," said Math, "we will seek, I and thou, by charms and illusion, to form a wife for him out of flowers. He has now come to man's stature, and he is the comeliest youth that was ever beheld." So they took the blossoms of the oak, and the blossoms of the broom, and the blossoms of the meadow-sweet, and produced from them a maiden, the fairest and most graceful that man ever saw. And they baptized her, and gave her the name of Blodeuwedd 426a.
After she had become his bride, and they had feasted, said Gwydion, "It is not easy for a man to maintain himself without possessions." "Of a truth," said Math, "I will give the young man the best Cantrev to hold." "Lord," said he, "what Cantrev is that?" "The Cantrev of Dinodig," he answered. Now it is called at this day Eivionydd and Ardudwy. And the place in the Cantrev where he dwelt, was a palace of his in a spot called Mur y Castell 426b, on the confines of Ardudwy. There dwelt he and reigned, and both he and his sway were beloved by all.
One day he went forth to Caer Dathyl, to visit Math the son of Mathonwy. And on the day that he set out for Caer Dathyl, Blodeuwedd walked in the Court. And she heard the sound of a horn. And after the sound of the horn, behold a tired stag went by, with dogs and huntsmen following it. And after the dogs and the huntsmen there came a crowd of men on foot. "Send a youth," said she, "to ask who yonder host may be." So a youth went, and inquired who they were. "Gronw Pebyr is this, the lord of Penllyn," said they. And thus the youth told her.
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Gronw Pebyr pursued the stag, and by the river Cynvael he overtook the stag and killed it. And what with flaying the stag and baiting his dogs, he was there until the night began to close in upon him. And as the day departed and the night drew near, he came to the gate of the Court. "Verily," said Blodeuwedd, "the Chieftain will speak ill of us if we let him at this hour depart to another land without inviting him in." "Yes, truly, lady," said they, "it will be most fitting to invite him."
Then went messengers to meet him and bid him in. And he accepted her bidding gladly, and came to the Court, and Blodeuwedd went to meet him, and greeted him, and bade him welcome. "Lady," said he, "Heaven repay thee thy kindness."
When they had disaccoutred themselves, they went to sit down. And Blodeuwedd looked upon him, and from the moment that she looked on him she became filled with his love. And he gazed on her, and the same thought came unto him as unto her, so that he could not conceal from her that he loved her, but he declared unto her that he did so. Thereupon she was very joyful. And all their discourse that night was concerning the affection and love which they felt one for the other, and which in no longer space than one evening had arisen. And that evening passed they in each other's company.
The next day he sought to depart. But she said, "I pray thee go not from me to-day." And that night he tarried also. And that night they consulted by what means they might always be together. "There is none other counsel," said he, "but that thou strive to learn from Llew Llaw Gyffes in what manner he will meet his death. And this must thou do under the semblance of solicitude concerning him."
The next day Gronw sought to depart. "Verily," said she, "I will counsel thee not to go from me to-day." "At thy instance will I not go," said he, "albeit, I must say, there is danger that the chief who owns the palace may return home." "To-morrow," answered she, "will I indeed permit thee to go forth."
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The next day he sought to go, and she hindered him not. "Be mindful," said Gronw, "of what I have said unto thee, and converse with him fully, and that under the guise of the dalliance of love, and find out by what means he may come to his death."
That night Llew Llaw Gyffes returned to his home. And the day they spent in discourse, and minstrelsy, and feasting. And at night they went to rest, and he spoke to Blodeuwedd once, and he spoke to her a second time. But, for all this, he could not get from her one word. "What aileth thee?" said he, "art thou well?" "I was thinking," said she, "of that which thou didst never think of concerning me; for I was sorrowful as to thy death, lest thou shouldst go sooner than I." "Heaven reward thy care for me," said he, "but until Heaven take me I shall not easily be slain" "For the sake of Heaven, and for mine, show me how thou mightest be slain. My memory in guarding is better than thine." "I will tell thee gladly," said he. "Not easily can I be slain, except by a wound. And the spear wherewith I am struck must be a year in the forming. And nothing must be done towards it except during the sacrifice on Sundays." "Is this certain?" asked she. "It is in truth," he answered. "And I cannot be slain within a house, nor without. I cannot be slain on horseback nor on foot." "Verily," said she, "in what manner then canst thou be slain?" "I will tell thee," said he. "By making a bath for me by the side of a river, and by putting a roof over the cauldron, and thatching it well and tightly, and bringing a buck, and putting it beside the cauldron. Then if I place one foot on the buck's back, and the other on the edge of the cauldron, whosoever strikes me thus will cause my death." "Well," said she, "I thank Heaven that it will be easy to avoid this."
No sooner had she held this discourse than she sent to Gronw Pebyr. Gronw toiled at making the spear, and that day twelvemonth it was ready. And that very day he caused her to be informed thereof.
"Lord," said Blodeuwedd unto Llew, "I have been thinking
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how it is possible that what thou didst tell me formerly can be true; wilt thou show me in what manner thou couldst stand at once upon the edge of a cauldron and upon a buck, if I prepare the bath for thee?" "I will show thee," said he.
Then she sent unto Gronw, and bade him be in ambush on the hill which is now called Bryn Kyvergyr, on the bank of the river Cynvael. She caused also to be collected all the goats that were in the Cantrev, and had them brought to the other side of the river, opposite Bryn Kyvergyr.
And the next day she spoke thus. "Lord," said she, "I have caused the roof and the bath to be prepared, and lo! they are ready." "Well," said Llew, "we will go gladly to look at them."
The day after they came and looked at the bath. "Wilt thou go into the bath, lord?" said she. "Willingly will I go in," he answered. So into the bath he went, and he anointed himself. "Lord," said she, "behold the animals which thou didst speak of as being called bucks." "Well," said he, "cause one of them to be caught and brought here." And the buck was brought. Then Llew rose out of the bath, and put on his trowsers, and he placed one foot on the edge of the bath and the other on the buck's back.
Thereupon Gronw rose up from the hill which is called Bryn Kyvergyr, and he rested on one knee, and flung the poisoned dart and struck him on the side, so that the shaft started out, but the head of the dart remained in. Then he flew up in the form of an eagle and gave a fearful scream. And thenceforth was he no more seen.
As soon as he departed Gronw and Blodeuwedd went together unto the palace that night. And the next day Gronw arose and took possession of Ardudwy. And after he had overcome the land, he ruled over it, so that Ardudwy and Penllyn were both under his sway.
Then these tidings reached Math the son of Mathonwy. And heaviness and grief came upon Math, and much more upon Gwydion than upon him. "Lord," said Gwydion, "I shall never rest until I have tidings of my nephew."
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[paragraph continues]"Verily," said Math, "may Heaven be thy strength." Then Gwydion set forth and began to go forward. And he went through Gwynedd and Powys to the confines. And when he had done so, he went into Arvon, and came to the house of a vassal, in Maenawr Penardd. And he alighted at the house, and stayed there that night. The man of the house and his house-hold came in, and last of all came there the swineherd. Said the man of the house to the swineherd, "Well, youth, hath thy sow come in to-night?" "She hath," said he, "and is this instant returned to the pigs." "Where doth this sow go to?" said Gwydion. "Every day, when the sty is opened, she goeth forth and none can catch sight of her, neither is it known whither she goeth more than if she sank into the earth." "Wilt thou grant unto me," said Gwydion, "not to open the sty until I am beside the sty with thee?" "This will I do, right gladly," he answered.
That night they went to rest; and as soon as the swineherd saw the light of day, he awoke Gwydion. And Gwydion arose and dressed himself, and went with the swineherd, and stood beside the sty. Then the swineherd opened the sty. And as soon as he opened it, behold she leaped forth, and set off with great speed. And Gwydion followed her, and she went against the course of a river, and made for a brook, which is now called Nant y Llew. And there she halted and began feeding. And Gwydion came under the tree, and looked what it might be that the sow was feeding on. And he saw that she was eating putrid flesh and vermin. Then looked he up to the top of the tree, and as he looked he beheld on the top of the tree an eagle, and when the eagle shook itself, there fell vermin and putrid flesh from off it, and these the sow devoured. And it seemed to him that the eagle was Llew. And he sang an Englyn:--
Darkened is the sky and hill!
Shall I not tell him by his wounds,
That this is Llew?"
Upon this the eagle came down until he reached the centre of the tree. And Gwydion sang another Englyn:--
Is it not wetted by the rain? Has it not been drenched
By nine score tempests?
It bears in its branches Llew Llaw Gyffes!"
Stately and majestic is its aspect!
Shall I not speak it?
That Llew will come to my lap?"
Then he went unto Caer Dathyl, and there were brought unto him good physicians that were in Gwynedd, and before the end of the year he was quite healed.
"Lord," said he unto Math the son of Mathonwy, "it is full time now that I have retribution of him by whom I have suffered all this woe." "Truly," said Math, "he will never be able to maintain himself in the possession of that which is thy right." "Well," said Llew, "the sooner I have my right, the better shall I be pleased."
Then they called together the whole of Gwynedd, and set forth to Ardudwy. And Gwydion went on before and proceeded to Mur y Castell. And when Blodeuwedd heard that he was coming, she took her maidens with her, and fled to the mountain. And they passed through the river Cynvael, and went towards a court that there was upon the mountain, and through fear they could not proceed except with their faces looking backwards, so that unawares they fell into the lake.
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[paragraph continues]And they were all drowned except Blodeuwedd herself, and her Gwydion overtook. And he said unto her, "I will not slay thee, but I will do unto thee worse than that. For I will turn thee into a bird; and because of the shame thou hast done unto Llew Llaw Gyffes, thou shalt never show thy face in the light of day henceforth; and that through fear of all the other birds. For it shall be their nature to attack thee, and to chase thee from wheresoever they may find thee. And thou shalt not lose thy name, but shalt be always called Blodeuwedd." Now Blodeuwedd is an owl in the language of this present time, and for this reason is the owl hateful unto all birds. And even now the owl is called Blodeuwedd.
Then Gronw Pebyr 432a withdrew unto Penllyn, and he dispatched thence an embassy. And the messengers he sent asked Llew Llaw Gyffes if he would take land, or domain, or gold, or silver, for the injury he had received. "I will not, by my confession to Heaven," said he. "Behold this is the least that I will accept from him; that he come to the spot where I was when he wounded me with the dart, and that I stand where he did, and that with a dart I take my aim at him. And this is the very least that I will accept."
And this was told unto Gronw Pebyr. "Verily," said he, "is it needful for me to do thus? My faithful warriors, and my household, and my foster-brothers, is there not one among you who will stand the blow in my stead?" "There is not, verily," answered they. And because of their refusal to suffer one stroke for their lord, they are called the third disloyal tribe even unto this day. "Well," said he, "I will meet it."
Then they two went forth to the banks of the river Cynvael, and Gronw stood in the place where Llew Llaw Gyffes was when he struck him, and Llew in the place where Gronw was. Then said Gronw Pebyr unto Llew, "Since it was through the wiles of a woman that I did unto thee as I have done, I adjure thee by Heaven to let me place between me and the
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blow, the slab thou seest yonder on the river's bank." "Verily," said Llew, "I will not refuse thee this." "Ah," said he, "may Heaven reward thee." So Gronw took the slab and placed it between him and the blow.
Then Llew flung the dart at him, and it pierced the slab and went through Gronw likewise, so that it pierced through his back. And thus was Gronw Pebyr slain. And there is still the slab on the bank of the river Cynvael, in Ardudwy, having the hole through it. And therefore is it even now called Llech Gronw.
A second time did Llew Llaw Gyffes take possession of the land, and prosperously did he govern it. And, as the story relates, he was lord after this over Gwynedd. And thus ends this portion of the Mabinogi.
Short description of Blodeuwedd the flower maiden.
http://en.wikipedia.org/wiki/Blodeuwedd
