 Today, the modern Llech Ronw stands on a farmstead known as Bryn Saeth, or the Hill of the Arrow.In the Fourth Branch of the Mabinogi (the story of Math ap Mathonwy), Lleu Llaw Gyffes is betrayed by his wife, Blodeuedd, when she elopes with Gronw Pebyr.Blodeuedd and Gronw plot to kill Lleu, and while Lleu is on the bank of Afon Cynfael, Gronw hurls a spear at him.