Cardigan, in Welsh Aberteifi, from its situation near the mouth of the Teifi, and Brecon, in Welsh Aberhonddu, from its site near the confluence of the Usk and Honddu, are examples of corrupted Welsh names in common use - Ceredigion, Brychan - which possess in addition pure Celtic forms. In the third division, English place-names are tolerably frequent everywhere and predominate in the Marches and on the South Wales coast.
David, Teilo, Illtyd and Cadoc in Dyfed, Morganwg, Gwent and Brycheiniog, comprising South Wales; Cynllo, Afan and Padarn in Ceredigion and Maesyfed, or Mid-Wales; and Deiniol, Dunawd, Beuno, Kentigern and Asaph in North Wales.
Thus Anglesea, Carnarvon, Merioneth and Flint were erected in North Wales; whilst out of the districts of Ystrad Tywi and Ceredigion in South Wales, the old dominions of the house of Dynevor, the counties of Carmarthen and Cardigan were formed.
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