Would that be the item of furniture, or the person holding the position? Or is there no differance? I ask because I took it to mean the person and translated it as " Chair of the Eisteddfod". It was wrong.
The Eisteddfod Chair is a physical chair awarded as a prize in the National Eisteddfod's competion for composing the best poem or collection of peoms written in strict-metre cynghanedd. Examples - https://eisteddfod.wales/gallery/cardiff-2018/chair-and-crown and https://www.peoplescollection.wales/items/599529