Arthur's Ivory Thrones
Sir Bruiant of the Isles gave these to Arthur and Guenevere.
The two thrones, made of gold and ivory with no wood at all, were absolutely identical. Each had the form of a leopard finely carved on one side and that of a crocodile on the other.
Arthur sat in one and had Erec sit in the other at the latter's coronation as King of Outre-Gales, which suggests that Arthur may from time to time, as a signal honor, have sat other people in the throne that would otherwise have been the Queen's.
It also sounds as if these thrones, dispite their weight, must have been among the items carried about with the court from city to city.