Aegis Has Greek and Latin Roots

We borrowed aegis from Latin, but the word ultimately derives from the Greek noun aigis, which means "goatskin." In ancient Greek mythology, an aegis was something that offered physical protection, and it has been depicted in various ways, including as a magical protective cloak made from the skin of the goat that suckled Zeus as an infant and as a shield fashioned by Hephaestus that bore the severed head of the Gorgon Medusa. The word first entered English in the 15th century as a noun referring to the shield or protective garment associated with Zeus or Athena. It later took on a more general sense of "protection" and, by the late-19th century, it had acquired the extended senses of "auspices" and "sponsorship."