Westminster Abbey
The Abbey contains the Westminster Retable, the oldest known panel painting altarpiece in England. It was painted in the 1270s by some of the Plantagenet court painters, probably for the High Altar. It was probably donated by Henry III of England as part of his Gothic redesign of the Abbey.  The painting survived only because it was incorporated into furniture between the 16th and 19th century and much of it has been damaged beyond restoration.  According to one specialist the "Westminster Retable, for all its wounded condition, is the finest panel painting of its time in Western Europe".