Heracles is the son of Zeus. Hera is the sister-wife of Zeus.
Heracles/Hercules was the son of Zeus by another woman (other than Hera/Juno); therefore, this made her very angry.
Heracles.
He was born in Thebes. His mother was Alcmeme amd his father was Zeus. His mother was married to Amphitryon and she slept with both her husband and Zeus on the same night, but Zeus was disguised as her husband. When his mother learned that Hera was angry, she abandoned the child and Athena takes the child to Hera and asks Hera to breast feed him. The breast milk of Hera helps to make the baby strong. Athena then returns the baby to Alcmeme. Originally the baby had been named Alcaeus but he was renamed Hercules because it means glory by the aid of Hera.
The simplest answer is jealousy. There was a time when Zeus declared that the next child born of his blood would rule Mykenai. He intended it to be Heracles. Hera put a lot of time and effort into trying to kill both Alcmene (Heracles mortal mother) and the infant, but when she failed she tormented Heracles until he went mad, killing his own children. Heracles was then forced to complete the 12 labours, with Hera opposing him at every turn.
Hera was the wife of the god Zeus. She had conflicts with other gods, which included Aphrodite and Heracles.
The Twelve Labors of Heracles were demanded by Hera, wife of Zeus, and given by Eurystheus, the king of Tiryns and Mycenae.
It means 'glory of Hera,' which is ironic because he was the son of Zeus (Hera's husband) by another woman. As a result, Hera detested him.
She didn't. Heracles (that is his Greek name) was born to Zeus and a mortal woman. Hera hated him like she hated all of Zeus' illegitimate children.
When Heracles was but a baby Hera may have sent serpents to kill him; he strangled these.
No, he was the son of Zeus and a mortal woman. Actually, his Greek name is Heracles, Hercules is Roman. Heracles means "glory of Hera". Zeus named him this in honor of Hera to pacify her because she became extremely angry when she learned that Zeus cheated on her. Even so, Hera drove Heracles into mad rages, causing him to kill his wife and children. The Twelve Labors of Heracles was his punishment. As I remember, there ended up being more than twelve in the end, but that's another story.
Simply being the son of Zeus by another woman (Alcmene).