 The best-known writer from that period was the poet Dionysios Solomos (1789–1857), who wrote the Greek national anthem "(Hymn to Liberty)" and other works celebrating the Greek Revolution of 1821–1830.His language became influential on the further course of standardisation that led to the emergence of the modern standard form of Demotic, based on the south-western dialects.Spoken modern vernacular Greek can be divided into various geographical varieties.