NIGHTBRINGER | The Arthurian Encyclopedia

Pumlumon

“Five Peaks”
Plynlimon, Pen Pumlumon Fawr

Pumlumon is a prominent and expansive mountain massif in the county of Ceredigion in Mid Wales. It is part of the Cambrian Mountains.

The warriors Cei and Bedwyr found Dillus the Bearded here and killed him.


Source
Culhwch and Olwen | Late 11th century