Object Date - Earliest:
The "Green Man" keystone from the ribbed vaulting of the Cistercian monastery at Zaraka (Peloponnesos). Possibly originally located in the Narthex, was found in the closed Sikyon Museum. From Fig.13 from Mouseion Journal of the Classical Association of Canada 52 Series 3 Vol. 8 No. 2, 2008 - David Rupp.