History of the Greek alphabet consonant letter, rather than seemingly have two exceptions in spelling. Greek, like Phoenician, made a distinction for vowel length; indeed, Greek had five short vowels and seven long vowels, but only five vowel letters. As in Phoenician, the difference in length was not originally made in writing. However, by the 6th century BC the letter eta (not needed for a consonant in eastern dialects of Greek, which lacked ) came to stand for the long vowel , and a new letter, omega, was developed for long . The provenance of omega is not known, but it is generally assumed to
History of the Greek alphabet of the Stoudion monastery in Constantinople. The earliest type of books written in minuscule, dated from the mid-9th to mid-10th century, are called codices vetustissimi ('oldest codices'). During the following centuries, this style of writing was further developed and took on more cursive elements again. This became the dominant type of handwriting until the post-Byzantine period. Together with the minuscule letter shapes, Greek writing also began to use word-boundary spaces and diacritics (i.e. the accent marks and breathings of polytonic orthography) more regularly. Some punctuation began also to be employed. The iota subscript was employed from the 13th century onwards.