A story about a witch. Does anyone know the name?

Mitija, a vengeful witch born of love and hate.

Medea, also translated as Medea, is a princess and priestess in the island country of Kocsis. She's doing well. She fell in love with Prince Jason who came from other places to fight against his father in order to get golden fleece. However, this marriage ended in tragedy. Mitija is the goddaughter of the moon goddess, so she knows how to use a lot of dark magic. She can concoct elixirs, divination and poison. He is not only proficient in magic, but also very clever and cruel. He once killed his brother for Jason. Later, because Jason moved on, he married the princess of a neighboring country. In a rage, Mitiga, abandoned by her lover, made a dress full of poison and gave it to Jason's fiancee to kill her. He even personally killed the two young children he gave birth to for Jason, and finally rode away sadly.