Sarah's Throne was a structure that was most likely made by Edd in "Sir Ed-a-Lot." The throne was inspired by Eddy's quote of "Next thing you know she's gonna want a throne!" As credited to Eddy's big mouth, the throne served as Sarah's seat of power for her "castle." From her throne, she gave commands and dictated what went on in Ed's house for the duration of her and Ed's parents not being home. The throne itself was constructed in the living room of their house and was made primarily of chairs stacked on top of each other.
However, later on in the episode, the throne was taken over by Eddy who turned the tables on Sarah by sending her to the dungeon. From then on, he became the king.