Never, as Cynthia was a epithet of Artemis/Diana, a virgin goddess of the hunt and wilderness and Zeus's daughter.
However, Cynthia was also a title of Selene, the Titan goddess of the Moon, whom Zeus did have children by. It isn't however known when they did, as Zeus had wives other than Hera before that marriage.
yes hera did cheat on zeus, but no one knows with who or how many times
yes
Zeus and Hera was his parents.
Hera, wife of Zeus.
Hera was the goddess of marriage. she was also Zeus's wife. (Zeus was the head god, so she was like a queen)Hera, wife of Zeus.
Hera is the wife of Zeus the god of the sky
Hera
Hera & Zeus.
Zeus
Zeus
Hera
Because Hera isn't allowed to cheat on Zeus only he can women back then weren't allowed to cheat on their husbands except Aphrodite.