Eclipsa Butterfly

"Eclipsa Queen of Mewni to a Mewman King was wed, but took a monster for her love, and away from Mewni fled."

- Pedestal in the Butterfly Castle "Grandma Room" Eclipsa Butterfly (also known as Eclipsa the Queen of Darkness) is a deceased character in the Disney XD animated series, Star vs. the Forces of Evil. She is the former ruler of Mewni and Star Butterfly's ninth great-grandmother.

Background
Little is known about Eclipsa, but what is revealed indicates a dark and/or less-than-respectable reputation. In "Into the Wand", Star discovers more of her family history during her venture inside her wand. In a place what she called the "Grandma Room" were tapestries representing the past and present Queens of Mewni, including her mother. According to a passage inscribed on one of the room's pedestals, Eclipsa was wed to a Mewman king, but she was already in love with a monster with red skin, white hair, and four eyes. Eclipsa later eloped with this monster and abandoned the Mewni throne.

During her life, Eclipsa developed a number of spells that were associated with dark magic. These spells were recorded in the pages of the wand's Magic Instruction Book and sealed behind a skull-shaped lock to prevent others from reading them. She was also the only member of the royal family who never questioned Glossaryck's teaching methods. According to Baby, Eclipsa had a very high affinity for magic compared to the other queens, rivaled only by Star herself. It is also presumed from a remark by King Butterfly that Eclipsa harbored sympathy for Mewni's monsters, a sentiment shared by very few of her fellow Mewmans and royals.