Cadrod Calchfynydd ap Cynwyd - Gwrgon Goddeu not be the spoue of Cadrod Calchynyd.

I noticed that you have Gwrgon Goddeu verch Brychan as the spouse of Cadrod Calchynyd if her birthdate is correct for a couple of reasons. First she would be between 71 and 131 years of age at the time of her son's birth. Second, she was at least 41 years older than her husband, Cadrod, when he was born. If she is the correct wife then her age is wrong and you are missing 2 or three generations between her and her father.