Milk of Hera

The standard telling goes that the mythical hero Heracles, as an infant, breastfed from an unsuspecting Hera, the goddess of marriage and Zeus's wife, who threw him away, causing a little bit of her milk to splash and create the galaxy with all its stars.

[3] It was said that once Heracles had been born, either Zeus or his son Hermes took the infant and brought him to Hera, who was sleeping, and placed him to her breast so that he could suckle from her.

Once Hera awoke and understood the situation, she pushed the baby away, and her unexpressed milk was sprayed.

But Heracles bit too hard on her breast, hurting her and forcing Hera to cast him aside in pain, as Athena returned him to his mortal parents.

Neither Diodorus nor Pausanias make such connection between the breastfeeding and Heracles suckling from his father's wife breast; Diodorus mentions another ritual, which included a mock labour with Hera acting as Alcmene, as the way Heracles was legitimized after his apotheosis.