Ilinden–Preobrazhenie Uprising

The Ilinden–Preobrazhenie Uprising (Bulgarian: Илинденско-Преображенско въстание, romanized: Ilindensko-Preobrazhensko vastanie), consisting of the Ilinden Uprising (Macedonian: Илинденско востание, romanized: Ilindensko vostanie; Greek: Εξέγερση του Ίλιντεν, romanized: Exégersi tou Ílinden) and Preobrazhenie Uprising, was an organized revolt against the Ottoman Empire from August to October 1903. It 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.

Source: Wikipedia — Ilinden–Preobrazhenie Uprising (CC BY-SA 4.0)