| AP CUOBELIN, Arvirargus Gweirdd | | B. 10 | | D. 60 |
| AP AFALLACH, Euddolen | | B. ABT 35 BC | | D. 90 |
| AP AFALLACH, Eudolen of Cambrian Briton | | B. ABT 12 BC | | D. 50 |
| AP ALAIN, Gradlon | | B. 582 | | |
| AP ALAIN DE BRETAGNE, King Hoël Judhael III | | B. ABT 580 | | D. 612 |
| AP ALCWN, Sandde of the Isle of Man | | B. 690 | | D. 755 |
| AP AMGOLYDD AP ANWERYDD, Dwfyn | | B. 140 | | |
| AP ANARAWD, Idwal Foel of Aberffro | | B. 883 | | D. ABT 942 |
| AP ANARAWD, Tudwal , of the Isles of MAN | | B. ABT 634 | | D. ABT 730 |
| AP ARTHEN, Dyfnwallon de Seisllwg | | B. 755 | | D. 841 |
| AP ARTHFODDW, Arnothen | | B. ABT 595 | | D. ABT 635 |
| AP ARTHFODDW, BRENIN CEREDIGION, Arthlwys | | B. 630 | | D. 675 |
| AP ARTHLWYS, Clydog de Ceredigion | | B. 660 | | D. 730 |
| AP ARTHWYR, Nowy Hen I | | B. ABT 605 | | D. ABT 650 |
| AP ATTILA, Elpfrat of The Huns | | | | |
| AP ATTILA, Tingiz of The Huns | | | | |
| AP AUTHUR, Nowys | | B. ABT 600 | | |
| AP BELI, Afallach | | B. 69 BC | | D. 16 BC |
| AP BELI, Gwylog , Brenin Powys | | B. ABT 660 | | D. 725 |
| AP BELI, Iago King of Gwynedd | | B. 540 | | D. 8 AUG 613 |
| AP BILI, Owen I of Strathclyde | | B. 644 | | D. 675 |
| AP BLEDDYN, Iorwerth de Hulton | | B. 1142 | | D. 1215 |
| AP BODDW, BRENIN CEREDIGION, Arthfoddw | | B. ABT 600 | | D. ABT 670 |
| AP BRAN, Caractacus King of Siluria | | B. 6 NOV 35 | | D. 80 |
| AP BROCHFAEL, Cadell , of Ceredigion and Powys | | B. 730 | | D. 808 |
| AP BROCHFAEL, Cynan Garwyn of Powys | | B. 544 | | D. 616 |
| AP BROCHWEL, Cyngen | | B. ABT 750 | | |
| AP BUDIC | | | | D. DECEASED |
| AP BUDIC, Hoël Mawr I of Brittany, De Cornwall | | B. 491 | | D. 545 |
| AP CADELL, Cyngen Glodrydd "the Renowned" | | B. 470 | | D. 550 |
| AP CADELL, Gwynfyw | | B. ABT 472 | | |
| AP CADELL, Tegid | | B. ABT 468 | | |
| AP CADELL DEYRNLLUG, Cyngen , of Powys | | B. 778 | | D. 855 |
| AP CADERYN, Rhuddfedd Frych | | B. 250 | | D. 300 |
| AP CADEYRN, Casnar Wledig | | B. 440 | | |
| AP CADFAN, Cadwallon II King of Gwynedd | | B. 610 | | D. 634 |
| AP CADFAN, Gwarfawr King of Dumnonnia | | B. ABT 358 | | |
| AP CADOR, Cadoc | | B. ABT 530 | | |
| AP CADOR, Custennin King of Dumnonia | | B. ABT 520 | | D. 589 |
| AP CADWALADR, Idwal Iwrch King of Gwynedd | | B. ABT 682 | | D. 720 |
| AP CADWALLON, Cadwaladr King of Gwynedd | | B. BEF 634 | | D. 682 |
| AP CADWALLON, Einion | | B. 516 | | |
| AP CADWALLON, Eurgain | | B. 520 | | |
| AP CADWALLON, son | | B. ABT 482 | | D. ABT 572 |
| AP CADWY, Peredyr (Perdyr) , OF DUMNONIA | | B. 535 | | |
| AP CALPUIRN, Maewyn Succat | | B. 372 | | |
| AP CARACTACUS, Cyllin King of Siluria | | B. 50 | | D. 99 |
| AP CARADOC, Cyllin Seal Of Siluria And Of Finland | | B. ABT 50 | | D. BEF 140 |
| AP CARADOG, Eurgen | | | | |
| AP CATEGERN, Rhyddfedd pf Powys | | B. ABT 435 | | D. 480 |
| AP CEIN, Gwyndog | | B. ABT 235 | | D. ABT 345 |
| AP CENEU, Eidion " Darianlas" | | B. ABT 402 | | |
| AP CENEU, Mor Maeswig of Northern Britain | | B. ABT 418 | | D. ABT 470 |
| AP CENEU, Pabo Post Prydyn of Britain | | B. 415 | | D. 9 NOV 530 |
| AP CEREDIG, Erp Erbin Seirb of Strathclyde | | B. 465 | | D. 480 |
| AP CEREDIG,, Usai King of Ceredigion | | B. ABT 449 | | D. 544 |
| AP CERI, Berwyn , of The Britons | | B. 21 MAY 90 BC | | D. 48 BC |
| AP CERWYD, Eneid Capior Digueil King of Druids | | B. ABT 194 BC | | D. ABT 112 BC |
| AP CLEMEN, Pedroc Duke of Cornwall | | B. ABT 580 | | |
| AP CLYDOG, Arthlwys | | B. 690 | | D. 730 |