The snake that baby Herakles holds at arm's length was sent by the goddess Hera to kill him when she found out that his father, Zeus, had been unfaithful with the mortal Alkmene of Thebes.
1928. Die Sammlung Eduard Gans: antike Schmucksachen und Gegenstände der Kleinkunst in Gold, Edelstein, Halbedelstein, Glas, Bronze. no. 38, p. 13, pl. 9.
Fogg Museum, Harvard Art Museums. 1954. Ancient art in American private collections. A loan exhibition at the Fogg Art Museum of Harvard University, December 28, 1954-February 15, 1955. no. 321, p. 38, pl. 88, Cambridge, Mass: Fogg Museum, Harvard Art Museums.
Metropolitan Museum of Art. 2000. "One Hundred Thirtieth Annual Report of the Trustees for the Fiscal Year July 1, 1999 through June 30, 2000." Annual Report of the Trustees of the Metropolitan Museum of Art, 130: p. 17.