This study deals with the Revolution of 1878 in Thessaly shortly before its annexation to the national body. It is mainly based on the archival material of the Diplomatic Historical Archive (YDIA) of the Ministry of Foreign Affairs, specifically on the reports, mostly unpublished, of the diplomats of that era, the consul in Larissa Ioannis R. Palamidis and the vice-consul in Volos Ioannis D. Tziotis, two relatively unknown diplomats of the time, who served selflessly in the Thessalian region. The study, also supported by other sources and literature, highlights unknown aspects of the Ottoman atrocities across Thessaly, touching on neighboring Macedonian areas, the revolutionary unrest, the role of national companies, aspects of the war events, the broader historical context of the era, the international diplomatic scene, the "amnesty" towards the revolutionaries, the Ottoman vacillations after the Treaty of Berlin, and scenes from the liberation. The book contains rare diplomatic sources.