The Four Ancient Books of Wales (Cymric Poems of the Sixth Century)

Cyndur was slain; beyond measure is the mourning for him.
Generous men were slain while they lived.
Three notable men of great fame were with Elgan.

original: Mirtin

Through and through, in great numbers, they came.
Across and across, Bran and Elgan came to me.
The slaying of Dinel from his stronghold—a massacre
Which the son of Erbin and his people committed.

The host of Maelgwn Maelgwn Gwynedd, king of North Wales came swiftly;
Warriors of battle, a brilliant slaughter on the field.
Is it not from the Battle of Arfderydd original: Arẏwderit; a historical battle fought c. 573 near Carlisle, which in legend caused Merlin’s madness
That the fate of their lives is prepared?

Many were the spear-thrusts and the blood-spilling on the field.
Many vigorous warriors will be broken.
Many are wounded, many flee,
And many are those who retreat in their combat.

The seven sons of Eliffer Eliffer Gosgorddfawr, a king of the "Old North" (northern England/southern Scotland); seven men when tested.
Seven spears they do not avoid in their seven divisions.

Seven fires of lightning; seven armies in opposition.
The seventh is Cynfelyn Cynfelyn Drwsgl, a northern hero often associated with this battle in every assault.

Seven spears of Govannon original: Gowanon; the smith-god of Welsh mythology, here used to denote divine or expertly crafted weapons; seven river-fulls
Of the blood of chieftains they shall fill.