| ||Your Majesty, I cast myself upon the mercy.|| |
| - Ceallach to Emhyr var Emreis, defending his son Cahir|
Ceallach Dyffryn aep Gruffyd was seneschal at the court of Emperor Emhyr var Emreis and lord of Darn Dyffra. He married Mawr who bore him six children: Aillil, Cahir, Dheran and three daughters (mentioned once in the series by Cahir).
He was Cahir's father.