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About 700 years ago before the start of the story, Diane left her home of Megadozer and rescued King. For the next 500 years, they spent their lives together and fell in love with one another. Due to circumstances involving King however, he had to erase her memories and leave her. None the wiser, she returned back to her people to be trained under a fellow giantess Matrona. Later about 16 years before the start of the story, Diane met and fell in love in Meliodas, not realizing she was unintentionally misdirecting her true feelings. She then was involved in a plot by some vile Liones knights who intended to kill her and Matrona for glory. Although she survived the incident, Diane was made into a scapegoat for the massacre that had happened. Meliodas fortunately intervened at her trial and recruited her into the Sins.