 Glagolitic appears to be older, predating the introduction of Christianity, only formalized by Cyril and expanded to cover non-Greek sounds.Cyrillic was created by the orders of Boris I of Bulgaria by Cyril's disciples, perhaps at the Preslav Literary School in the 890s.The earliest form of Cyrillic was the "ustav", based on Greek uncial script, augmented by ligatures and letters from the Glagolitic alphabet for consonants not found in Greek.