Ilinden–Preobrazhenie Uprising in the context of "Tsarevo"

The Internal Macedonian Revolutionary Organization (IMRO; Bulgarian: Вътрешна македонска революционна организация (ВМРО), romanized: Vatreshna Makedonska Revolyutsionna Organizatsiya (VMRO); Macedonian: Внатрешна македонска револуционерна организација (ВМРО), romanized: Vnatrešna Makedonska Revolucionerna Organizacija (VMRO)), was a secret revolutionary society founded in the Ottoman territories in Europe, that operated in the late 19th and early 20th centuries.

Founded in 1893 in Salonica, it sought sovereignty for Macedonia under the slogan Macedonia for the Macedonians. Initially it aimed to gain autonomy for Macedonia and Adrianople regions in the Ottoman Empire, however, it later became an agent serving Bulgarian interests in Balkan politics. IMRO modeled itself after the earlier Bulgarian Internal Revolutionary Organization of Vasil Levski and accepted its motto "Freedom or Death" (Свобода или смърть). According to the memoirs of some founding and ordinary members, in the Organization's earliest statute from 1894, the membership was reserved exclusively for Bulgarians. This was later changed on the initiative of Gotse Delchev, who wanted IMRO to depart from its exclusively Bulgarian nature, so he opened the membership for all inhabitants of European Turkey and the organization begun to acquire a more separatist stance. However, these new formulas as a whole failed to attract other ethnic groups, from whom it was seen as a pro-Bulgarian society, thus IMRO remained with base only among Bulgarian Exarchist affiliated Slavic speakers in Ottoman Macedonia. It used the Bulgarian language in all its documents and in its correspondence. The Organisation founded in 1896 its Foreign Representation in Sofia, the capital of Bulgaria. Starting in the same year, it fought the Ottomans using guerrilla tactics, and in this, they were successful, even establishing a state within a state in some regions, including their tax collectors. This struggle escalated in 1903 with the Ilinden–Preobrazhenie Uprising. The fighting involved about 15,000 IMRO irregulars and 40,000 Ottoman soldiers, lasting for over seven weeks. After the uprising failed, and the Ottomans destroyed some 100 villages, the IMRO resorted to more systematic forms of terrorism targeting civilians. More important, the Ilinden disaster splintered IMRO and signalled the beginning of a fratricidal conflict between the left-wing faction ("federalists") who continued to favor autonomy as step towards independent Macedonia and its inclusion into a future Balkan Federation, and the right-wing faction ("centralists") which favored unification with Bulgaria. In fact, the division was a culmination of a conflict which existed within IMRO since its formation. It was based partially on ideology, and partly in terms of personality and locality, and it would plague the Macedonian revolutionary movement over the next decades.

In the earliest dated samples of statutes and regulations of the clandestine Internal Macedonian Revolutionary Organization (IMRO) discovered so far, it is called Bulgarian Macedonian-Adrianopolitan Revolutionary Committees (BMARC). These documents refer to the then Bulgarian population in the Ottoman Empire, which was to be prepared for a general uprising in Macedonia and Adrianople regions, aiming to achieve political autonomy for them. In thе statute of BMARC, that itself is most probably the first one, the membership was reserved exclusively for Bulgarians. This ethnic restriction matches with the memoirs of some founding and ordinary members, where is mentioned such a requirement, set only in the Organization's first statute. In fact, the founders of IMRO were sympathetic to Bulgarian, but hostile to the Serbian nationalism, which led them to establish in 1897 a Society against Serbs. The organization's ethnic character is confirmed by the lack of any mention of Macedonian ethnicity. The name of BMARC, as well as information about its statute, was mentioned in the foreign press of that time, in Bulgarian diplomatic correspondence, and exists in the memories of some revolutionaries and contemporaries.

Due to the lack of original protocol documentation, and the fact its early organic statutes were not dated, the first statute of the Organisation is uncertain and is a subject to dispute among researchers. The dispute also includes its first name and ethnic character, as well as the authenticity, dating, validity, and authorship of its supposed first statute. Moreover, in North Macedonia, any Bulgarian influence on the country's history is a source of ongoing disputes and sharp tensions, thus such historical influences are often rejected by Macedonian researchers in principle. Certain contradictions and even mutually exclusive statements, along with inconsistencies exist in the testimonies of the founding and other early members of the Organization, which further complicates the solution of the problem. It is not yet clear whether the earliest statutory documents of the Organization have been discovered. Its earliest basic documents discovered for now, became known to the historical community during the early 1960s.

Slavic-speakers inhabiting the Ottoman-ruled region of Macedonia had settled in the area since the Slavic migrations during the Middle Ages and formed a distinct ethnolinguistic group. While Greek was spoken in the urban centers and in a coastal zone in the south of the region, Slav-speakers were abundant in its rural hinterland and were predominantly occupied in agriculture. Habitually known and identifying as "Bulgarian" on account of their language, they also considered themselves as "Rum", members of the community of Orthodox Christians.

After the emergence of rival national movements among Balkan Christians, the allegiance of Macedonian Slavs became the apple of discord for nationalists vying for dominion over the region of Macedonia. Parties with national affiliations, mostly Greek and Bulgarian, were formed in their midst, largely expressing and accentuating pre-existing social cleavages. From the 1870s onwards Bulgarian, Greek and Serbian propaganda appealed to them via the creation and operation of national education networks and by supporting the structures of the Bulgarian Exarchate or the Patriarchate of Constantinople respectively. Attempting to instill the "proper" national sense in Macedonian Slavs, and validate the territorial claims over Macedonia in that way. Amidst worsening economic and political conditions for Slav peasants, the clandestine Internal Macedonian Revolutionary Organization, founded in 1893, gained a wide following with a program of agrarian reform imposed by terror, culminating in the staging of the Ilinden uprising of 1903, which was swiftly suppressed by the Ottomans. An armed clash ensued within Slav communities resistant to national proselytization, with IMRO komitadjis fighting against Ottoman authorities and bands of Greek and Serbian nationalists until the pacification imposed after the Young Turk Revolution in 1908. At that time the international observers viewed the majority of them as Bulgarian.