See also
| Partner: | Seisyll ap CLYDOG (c. 700-740) | |
| Partner: | (unknown) | |
| Children: | Arthen ap SEISYLL (c. 735-807) | |
| Name: | Seisyll ap CLYDOG | |
| Sex: | Male | |
| Father: | Clydog ab ARTHGLWYS ( - ) | |
| Mother: | - | |
| Birth | c. 0700 | Ceredigion, Wales |
| Death | 0740 (age 39-40) | Ceredigion, Wales |
| Name: | Arthen ap SEISYLL | |
| Sex: | Male | |
| Birth | c. 0735 | |
| Death | 0807 (age 71-72) | |