Wikipedia Trails: From Aegis to Perseus

1. Aegis. Aegis is a shield that both Athena and Zeus carry, although it is more often see with Athena. However, while commonly seen as a shield, it can also be portrayed as the head of a Gorgon or animal skin. The word is associated with protection.

2. Gorgon. Gorgon means "dreadful" although it can resemble the sound of growling. They were known for their gaze because it turned people to stone, so it they were placed on objects as protection. They are also associated with Athena.

3. Medusa. Medusa means "guardian"; I had not expected this, but it does make sense, considering her ability. Athena places Medusa's head on her shield. She is the daughter of Gorgon.

Medusa by Alicechan. Source.

4. Perseus. Perseus beheaded Medusa and gave her head to Athena. He was known to kill monsters and rescued Andromeda from one. He was related to Heracles in a strange way-- he was his half-brother as well as his great grandfather.