Gronw Pebr is a character from Welsh mythology, specifically featured in the collection of tales known as the Mabinogion. He is often depicted as a powerful figure associated with the natural world and is known for his connection to the sun and fertility. In the stories, Gronw Pebr is best known for his tragic love affair with Blodeuwedd, a woman created from flowers. Their relationship leads to conflict and ultimately to Gronw's downfall, illustrating themes of love, betrayal, and the consequences of one's actions in the rich tapestry of Welsh folklore.