Ednyfed Fychan (d. 1246) was a servant to Llywelyn from 1215 to 1240 and for a large part of the time was lord steward to the Prince (one of the most important offices in the administration). In his capacity as steward, Ednyfed represented his Prince in negotiations with Henry III, King of England, as well as other lords and princes.
Ednyfed married Gwenllian, daughter of Lord Rhys. They had six or seven sons, each of which followed their father into the service of the Princes of Gwynedd. Goronwy ab Ednyfed (son of Ednyfed), became steward to Llywelyn the Last by 1258. After Goronwy's death, his brother Tudur ab Ednyfed became steward (even after he had pledged an oath of fealty to the English King Henry III and spent time in exile). Because of their service to the Welsh princes, the family gained land and became some of the wealthiest in North Wales.