| AP SANDDE, Pyll | | B. ABT 862 | | |
| AP SEISEYLLT, Rotpert | | | | |
| AP SEISYLL, Arthen | | B. ABT 720 | | D. ABT 807 |
| AP SEISYLL, Cynan | | B. 984 | | D. 1025 |
| AP SEISYLL, Hywel | | | | D. 1021 |
| AP SEISYLL, Llywelyn | | B. 980 | | D. 23 OCT 1023 |
| AP SELYF, Beli | | B. BEF 925 | | |
| AP SELYFAN, Aldrien | | B. 390 | | D. 464 |
| AP SENYLLT HAEL OF STRATHCLYDE, Neithon | | B. 420 | | |
| AP SERWYL, Usai | | B. ABT 510 | | |
| AP TECFAN,, Cunobelinus 'Cynfelyn' ap King of the Britons and the Catuvellauni | | | | D. 40 |
| AP TEGFAN, Guotepauc Gloff | | B. ABT 330 | | D. ABT 400 |
| AP TEGID, Padarn Beisrudd | | B. 325 | | D. 402 |
| AP TEGONWY, Bleddud | | B. ABT 760 | | |
| AP TEITHALL, Teithrin | | B. ABT 290 | | |
| AP TEITHFALL, Tewdrig Brenin of Garthmadrum | | B. ABT 355 | | |
| AP TEITHRIN, Teithfall Brenin of Garth Madrum | | B. ABT 330 | | |
| AP TEWDWR, Maredudd | | B. ABT 732 | | D. 811 |
| AP TRYFFIN AP ALED, Agricola | | B. ABT 410 | | |
| AP TUDBWYLL, Deheuwaint | | B. ABT 280 | | D. ABT 350 |
| AP TUDOR TREVOR, Lluddocca | | B. ABT 934 | | D. 1037 |
| AP TUDUR, Goronwy | | B. ABT 930 | | D. 1031 |
| AP TUDWAL, Dylan Traws of Nant Conwy | | B. ABT 395 | | D. ABT 447 |
| AP TYBION,, Meirion | | B. ABT 423 | | |
| AP URBAN, Tehvant | | B. 270 | | D. 300 |
| AP URBAN, Telpwyll | | B. 280 | | D. 340 |
| AP USAI, Serwyl of Ceredigion | | B. ABT 490 | | D. 523 |
| AP VORTIGERN, Faustus | | B. ABT 416 | | D. 490 |
| AP YNYR, Caradoc Vreichvras of Broërec | | B. ABT 470 | | D. ABT 550 |
| AP YNYR, Ceidio | | B. 466 | | |