The Ilinden–Preobrazhenie Uprising, or simply the Ilinden Uprising of August - October 1903 (Bulgarian: Илинденско-Преображенско въстание, Ilindensko-Preobražensko vǎstanie; Macedonian: Илинденско востание, Ilindensko vostanie; Greek: Εξέγερση του Ίλιντεν, Eksegersi tou Ilinden), 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. The name of the uprising refers to Ilinden, a name for Elijah's day, and to Preobrazhenie which means Transfiguration. The revolt lasted from the beginning of August to the end of October and covered a vast territory from the eastern Black Sea coast to the shores of Lake Ohrid.