Dyfed, Dyved. A region of south-western Wales much associated with the action of the
Mabinogi, the home of
Pwyll, and one of the most Irish-influenced areas of the principality. The modern county of Dyfed, created 1974, containing the former shires of Pembroke, Carmarthen, and Cardigan, is far more extensive than the ancient kingdom. The Romans called the region Demetia after the
P-Celtic people
Demetae, who had lived here from pre-Roman times. From late Roman times the area was invaded and settled by the
Déisi and by the ‘sons of Liathán’, the Uí Liatháin of what is now east Co. Cork, whose descendants formed the ruling dynasty until at least the 10th century. In Irish stories these invaders are described as the Déisi, from adjacent Co. Waterford, as led by
Eochaid (9). The first and third branches of the Mabinogi are set here, both concerning the family of Pwyll, Lord of Dyfed.
Pryderi, son of Pwyll, who figures in all four branches, is born in Dyfed. A mysterious realm lies within or beside it, where Pwyll loses his companions while hunting and comes face to face with fearful
Arawn, king of the deathly realm of
Annwfn. In the third branch
Manawydan is given land in Dyfed when suddenly, following a thunderclap, it is left desolate, without creature or habitation. Later it is revealed that this enchantment was caused by
Llwyd in revenge for the treatment of
Gwawl; Llwyd then restores the land. Pendaran is the ‘chief thunderer of Dyfed’. According to medieval materials collected in
The Myvyrrian Archaiology of Wales (1801–7), giving characteristics of the people of different parts of the principality, those from Dyfed are serfs.