Galfridus Yonge
M
| Father | Ierwerth, Welsh King |
| Mother | Margaret Yonge |
Galfridus was born. Galfridus married Margareta Petro, daughter of Johannia S'c'o Petro, in England. Galfridus and his brother, Morgan took on the surname of their mother.
Family | Margareta Petro |
| Child |