Helen of Troy.

 Helen of Troy (Ἑλένη) or Helen of Sparta and beautiful Helen. She was the most beautiful woman in the world. Her parents were Zeus (Ζεύς) and Leda (Λήδα). 

When beautiful Helen was a child, she was kidnapped by Theseus (Θησεύς) and Pirithous (Πειρίθοος). Helen of Sparta was in the temple of Artemis during that time. But they took Helen of Troy to Athens.

She lived in Sparta. Her husband was Menelaus (Μενέλαος,). They had a daughter Hermione (Ἑρμιόνη).

Hera (Ἥρα), Athena (Ἀθῆναι), and Aphrodite (Ἀφροδίτη,) had a dispute. Helen of Sparta was abducted by Paris. The apple of discord was the reason for this. 

During Judgment of Paris gave this golden apple of discord to Aphrodite. She promised to reward Paris with the woman he loves. He abducted beautiful Helen. 

Later the Trojan War started.

There are many paintings and statues about Helen of Troy.

Source of image:

https://www.shutterstock.com/ru/image-vector/paris-helen-after-ancient-painting-vintage-271069583

Source of image:

https://www.shutterstock.com/ru/image-vector/trojan-war-fourth-variant-vector-illustration-316915091

Source of image:

https://www.shutterstock.com/ru/image-vector/heroes-ancient-greek-myths-theseus-abducts-1284072952

Apple of Discord.

 Apple of Discord is also known as Golden Apple of Discord (μῆλον τῆς Ἔριδος). It created a dispute between three goddesses.

Eris wasn't invited to the wedding of Peleus and Thetis. She became angry.

So, she decided to give them the Apple of Discord. Eris wanted to make the goddesses quarrel. 

Athena, Aphrodite, and Hera saw the Golden Apple of Discord. It was written "to the most beautiful" (τῇ καλλίστῃ). The goddesses began to argue about it.

Paris judged Athena, Aphrodite, and Hera. He gave the Apple of Discord. She helped him steal Helen of Troy. Later the Trojan War started.

This legend became famous in Ancient Greece. Also, the phrase "apple of discord" means that small quarrels can turn into big conflicts.

Eris.

Eris (Ἔριδα) was a goddess of discord and strife in Ancient Greece. Her parents were Zeus and Nyx or Erebus and Hera. Also, she had many siblings among other gods and goddesses. Aphrodite, Hermes, Ares, Athena, Heracles, and ect. were all her relatives.

Eris had her own symbol. She was known for her Golden Apple of Discord. Eris gave her symbol during Peleus and Thetis wedding. So, Athena, Aphrodite, and Hera became angry. After this event the Trojan War started.

Eris had several children.

There are many paintings and statues of this goddess.