 It is believed that the original letters were fitted to Macedonian dialects specifically.The number of letters in the original Glagolitic alphabet is not known, but it may have been close to its presumed Greek model.The 41 letters known today include letters for non-Greek sounds, which may have been added by Saint Cyril, as well as ligatures added in the 12th century under the influence of Cyrillic, as Glagolitic lost its dominance.