The story goes that there was a prince in Troy called Ganymede. He was very handsome and gentle. His handsome appearance was quite rare even among the divine.
The only woman he deeply loved was the cup-bearer for Zeus. She once captured his heart by her sweet singing at night and prevented other girls of getting the attention of the prince.
Helen was the name of this cupbearer. She had the same name as the most beautiful woman in Troy. Zeus was in favor of Helen even though she was just a maid. Once, Helen accidentally heard about Apollo and Athena’s plan to attack Troy. Helen tipped off the plan regardless of the consequences. However, she was caught on the way and taken back to the divine temple. Zeus was hesitant to kill her but decided to seriously punish her. Reminded by his son Apollo, Zeus decided to pass the guilt to Helen and the prince.
On that day, Zeus transformed himself into a hawk flying over the sky of Troy. He quickly focused on Prince Ganymede walking in the garden and was attracted by his handsome appearance. He had seen many beauties but never saw such a good-looking boy. At this moment, an evil thought came into his mind and Zeus flew down to the mountain in the form of a large bird, whisking Ganymede away to the heavens.
Zeus ordered Ganymede to be his cupbearer to replace Helen. However, Zeus’ wife Hera was jealous of Ganymede’s good looks and decided to trick him. One night, Hera let Helen go secretly because she knew that Helen would find Ganymede to elope. As it turned out, they were all captured by Hera. Zeus was angry about their behavior and determined to kill Ganymede. But when the archer Chiron tried to shoot Ganymede, Helen warded off the arrow with her body.
Unable to have things her way, Hera was so angry that she transformed Ganymede as a clear cup to pour water for Zeus forever. This constellation is placed in the sky near other watery constellations including a dolphin (Delphinus), the sea monster (Cetus) and a fish (Pisces).