Monumentum Aion from Nida This lion-headed figure from Nida, present-day Frankfurt-Heddernheim, holds a key and a shovel in his hands. Mithraeum.eu22 May 2021Updated 18 Jan 2022 Frontal view from Aion of HeddernheimArachne The full article is reserved for our members. Log in or create a free account to access the entire site. A lion-headed figure, dressed only in a loincloth, holds a key in his left hand and a fire shovel in his right. A snake ascends from his right leg and coils around his abdomen, on whose chest is a face.