Probably French, 13th century and later

the gate inscribed: AUREA PORTA

A condition report authored by Dr. Heather Gilderdale Scott is available from the department upon request.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

This circular stained glass panel shows a depiction of Joachim and Anna meeting at the Golden Gate of Jerusalem, as told in the popular apocryphal story about the parents of the Virgin Mary. The iconography of the scene is firmly identified by the inscription Aurea Porta (Golden Gate), even though Joachim is unusually depicted with wings. Although the wings are medieval pieces of glass, it is likely they were inserted later, perhaps by a restorer who thought the iconography to be of an Annunciation, a better known scene. 

In style, the panel compares well to the stained glass of the great cathedrals of the early thirteenth century, and perhaps in particular to a panel of Anna and Joachim at the Golden Gate in Chartres Cathedral, part of a window depicting scenes of the Life of the Virgin, which shows a similar composition.

A report authored by Dr Heather Gilderdale Scott, Secretary to the Committee of the Corpus Vitrearum Medii Aevi (Medieval Stained Glass in Great Britain) is available upon request.