Greek nationalism, otherwise referred to as Hellenic nationalism, refers to the nationalism of Greeks and Greek culture. As an ideology, Greek nationalism originated and evolved in classical Greece. In modern times, Greek nationalism became a major political movement beginning in the early 19th century, which culminated in the Greek War of Independence (1821–1829) against the Ottoman Empire. Greek nationalism became also a potent movement in Greece shortly prior to, and during World War I, when the Greeks, inspired by the Megali Idea, managed to liberate parts of Greece in the Balkan Wars and after World War I, briefly occupied the region of Smyrna before it was retaken by the Turks. Greek nationalism was also the main ideology of two dictatorial regimes in Greece during the 20th century: the 4th of August Regime (1936-41) and the Greek military junta (1967-74). Today Greek nationalism remains important in the Greco-Turkish dispute over Cyprus among other disputes (Greek nationalism in Cyprus). Ancient GreecePanhellenic GamesByzantine Greeks#Identity and Greeks#Identity The establishment of Panhellenic sites served as an essential component in the growth and self-consciousness of Greek nationalism. During the Greco-Persian Wars of the 5th century BCE, Greek nationalism was formally established though mainly as an ideology rather than a political reality since some Greek states were still allied with the Persian Empire. Aristotle and Hippocrates offered a theoretical approach on the superiority of the Greek tribes. The establishment of the ancient Panhellenic Games is often seen as the first example of ethnic nationalism and view of a common heritage and identity. During the times of the Byzantine Empire and after the capture of Constantinople in 1204 by the Latins, the Roman Emperor John III Doukas Vatatzes made extensive use of the words 'nation' (genos), 'Hellene' and 'Hellas' together in his correspondence with the Pope. John acknowledged that he was Greek, although bearing the title Emperor of the Romans: "the Greeks are the only heirs and successors of Constantine", he wrote.