Answer
The Ilinden-Preobrazhenie Uprising, also known as the St. Elijah's Day Uprising, was an organized rebellion led by Gotse Delchev and other prominent figures of the Internal Macedonian Revolutionary Organization (IMRO). Planned for over a year, the uprising aimed to liberate the Ottoman-ruled Macedonia and Adrianople regions, incorporating them into an autonomous Macedonia within the broader framework of an autonomous Ottoman state.