| ||Your Majesty, I cast myself upon thy mercy.|| |
| - Ceallach to Emhyr var Emreis, defending his son Cahir|
Ceallach Dyffryn aep Gruffyd was the father of Cahir and a 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.
In Loc Grim, the summer residence of the Emperor, when Emhyr ordered to Vattier de Rideaux to capture Cahir due to his "treason", Ceallach tried to ask for mercy for his son to the emperor. The latter however, didn't listen to him, saying that traitors must be punished. 
- See the GWENT standalone game version card: Ceallach Dyffryn