Iris

 

Iris was the personification of the rainbow in Greek mythology, as well as messenger of the gods along with Hermes. She was also known as the goddess of the sea and the sky. She was the daughter of Thaumas and Electra, sister to Arke, Aello, Celaeno and Ocypete. She was married to Zephyrus, the god of the west wind, and had a son, Pothos. It was said that she travelled on the rainbow while carrying divine messages to the mortals. She was depicted carrying a pitcher filled with water from the River Styx, which she gave to anyone who perjured themselves, putting them to sleep.