Later, during the 18th and early 19th centuries, the Ionian Islands, then also under Italian rule, became a centre of literary production in Demotic Greek. 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.