Note 16 — Chapter II · SIENA AND THE CONTINUING OF THE MEDIÆVAL STYLE
Reading edition
Sirén, Burlington Magazine, XXXII (1918) p. 45, ascribes this panel to Cavallini. Berenson in Dedalo, Vol. II, fasc. v, allots it to Constantinople at the end of the 12th century. Neither view is even plausible to me.