The Greek War of Independence, spanning from 1821 to 1832, was a seminal nationalist movement against the long-standing Ottoman Empire, which had subjugated Greece for centuries. Fueled by the ideals of liberalism and nationalism spreading across Europe, Greek revolutionaries, supported by educated elites and philhellenists from abroad, sought to establish an independent Greek nation-state. Poets like Lord Byron even volunteered to fight. The struggle gained significant European public sympathy, particularly from intellectuals who revered ancient Greek culture. Major European powers, initially hesitant, eventually intervened, leading to the Treaty of Constantinople in 1832, which recognized Greece as an independent nation. This event was a powerful early demonstration of successful nationalism in 19th-century Europe.