Charlotte R. Long wrote in her book The Twelve Gods of Greece and Rome (p. 295) that the 1st century C.E. altar, found in Gabii in 1793 by Gavin Hamilton shows the twelve heads of the Roman gods in relation to the zodiac signs relieves that run along the side of the cylinder with their symbols. Mars rules Scorpio and his symbol is the Wolf.
I copied this picture from Wikimedia Commons. It was Uploaded by Jastrow (2006) entry: Image:Altar twelve gods Louvre Ma666.jpg