Further detail is supplied in later legendary traditions, notably those represented by the Welsh Triads ("Trioedd Ynys Prydein"). One listing the three "Horse-Burdens" of Britain relates that Gwrgi, Peredur, Dynod Bwr and Cynfelyn Drwsgl were carried by a horse called Corvan, which enabled them to watch the clouds of dust ("battle-fog") coming from Gwenddoleu and his (mounted) forces in the battle of Arfderydd. The circumstances in which Gwrgi and Peredur died are alluded to in a Triad which explains that they had one of "Three Faithless Warbands of the Island of Britain". Their warband abandoned them at Caer Greu on the day before a battle with Eda "Glinmaur" ("Great-Knee") and so they were slain. The Welsh Triads also refer to family relations. One on the "Three Fair Womb-Burdens" of Britain, preserved incompletely in Peniarth MS 47, suggests that Peredur and Gwrgi had a sister called Arddun, while a variant version in Peniarth MS 50 calls the third sibling Ceindrech Pen Asgell ("Wing-head") and names the mother Efrddyl verch Gynfarch. Peredur is said to have had a son by the name of Gwgon Gwron, called one of the three "Prostrate Chieftains" ("Lledyf Vnben") because "they would not seek a dominion, which nobody could deny to them".