History of the Greek alphabet retained the sound. A symbol based on the left-hand half ( ├ ) of the letter Η was therefore sometimes used to indicate the presence of where necessary, and its absence was indicated by a symbol based on the right half. During the classical period, ΕΙ came to be pronounced and ΟΥ came to be pronounced , Υ having meanwhile moved to . By about 200 BC, a system of diacritical marks was invented, representing the tone accents in use in Ancient Greek. This also helped to indicate the length of the vowels Α, Ι, and Υ in certain cases
History of the Greek alphabet of the same name, he would have lived at the time of Oedipus. The third tripod bears the inscription again in hexameter verse: . (""Laodamas, while he reigned, dedicated this cauldron to Apollo, the sure of aim, as a lovely offering""). Hyginus recounts the following legend about the introduction of Phoenician letters to Greece: Some ancient Greek scholars argued that the Greek alphabet should not be attributed to the Phoenician alphabet. Diodorus Siculus in his Historical Library, Book 5, suggests that the Phoenicians merely changed the form and shape of earlier letters: In his book On the malice of Herodotus,