Editing Gronw Pebr (section)

==Role in Welsh tradition==
[[File:Blodeuwedd and Gronw.jpeg|thumb|Gronw chances across Blodeuwedd.]]

[[Lleu Llaw Gyffes]] has been placed under a [[tynged]] that he would never gain a wife of human birth. His uncle, the [[trickster]] and magician [[Gwydion]] joins forces with the [[Kingdom of Gwynedd|Venedotian]] king [[Math fab Mathonwy]] to create a woman for Lleu, out of the flowers of oak, [[Genisteae|broom]] and [[Filipendula ulmaria|meadowsweet]], naming her Blodeuwedd. One day, while Lleu is away on business, Gronw Pebr, lord of Penllyn, comes across Lleu's stronghold whilst out hunting and falls in love with Blodeuwedd. They conspire to kill Lleu so that they can be together.

Lleu can only be killed if certain conditions are met, and Blodeuwedd tricks him into revealing what these conditions are. He can not be killed indoors or outdoors, on horseback or on foot. Consequently, he can only be killed whilst he has one foot on a cauldron and one on a goat (the cauldron being placed on a stream bank but under a roof) and by someone using a spear forged over a year and only when people are attending mass.

Blodeuwedd coaxes the secret from Lleu and a year later, Gronw ambushes the prince. He flings the spear at Lleu, who disappears in the form of an eagle. Gronw and Blodeuwedd now assume power, but on hearing the news of his nephew Gwydion sets out to find and cure him. He finds Lleu in the form of a wounded eagle perched in an oak tree and restores him to human form.

Together they overcome Gronw, and make him stand in the same position that Lleu occupied when Gronw flung the spear at him. Gronw is allowed to hold a stone as a shield, but Lleu throws the spear so hard that it penetrates the stone and kills Gronw. Gwydion curses Blodeuwedd, turning her into an owl.