The Ilinden–Preobrazhenie Uprising, or simply the Ilinden Uprising, of August–October 1903 (Bulgarian: Илинденско-Преображенско въстание, Ilindensko-Preobrazhensko vastanie; Macedonian: Илинденско востание, Ilindensko vostanie; Greek: Εξέγερση του Ίλιντεν, Exégersi tou Ílinden), was an organized revolt against the Ottoman Empire, which was prepared and carried out by the Internal Macedonian-Adrianople Revolutionary Organization, with the support of the Supreme Macedonian-Adrianople Committee, which included mostly Bulgarian military personnel. The name of the uprising refers to Ilinden, a name for Elijah's day, and to Preobrazhenie which means Feast of the Transfiguration. Some historians describe the rebellion in the Serres revolutionary district as a separate uprising, calling it the Krastovden Uprising (Holy Cross Day Uprising), because on September 14 the revolutionaries there also rebelled. The revolt lasted from the beginning of August to the end of October and covered a vast territory from the western Black Sea coast in the east to the shores of Lake Ohrid in the west.