Dyfedeg orY Ddyfedeg is one of the four traditionaldialects of theWelsh language. Spoken in south-west Wales, the language takes its name from theIron Age tribe theDemetae, who would also give their name to the post-RomanKingdom of Dyfed.

Writing in 1900,John Rhŷs andDavid Brynmor Jones referred to the dialect as "Demetian" and noted it was "closely connected" to the neighboringGwenhwyseg, or "Silurian Welsh". The writers also give a boundary for the dialect as "northwards, as far as the stream of Wyrai atLlanrhystud".^[1]

Today, many of the communities with the highest numbers of Welsh speakers are found in the traditional area for Ddyfedeg. As such, it is one of the most common forms of Welsh spoken today. The dialect (along with Gwenhwyseg andPowyseg) also forms a major constituent part of the wider "Southwalian dialect".^[2]

• W. Meredith Morris,A Glossary of the Demetian Dialect of North Pembrokeshire (with Special Reference to the Gwaun Valley) (Tonypandy, 1910)
• Alan R. Thomas,The Linguistic Geography of Wales (Cardiff, 1973)

• Landsker Line

• Welsh dialects
• Dyfed

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