Cyrillic script consonants from the older Glagolitic alphabet for sounds not found in Greek. Tradition holds that Cyrillic and Glagolitic were formalized either by Saints Cyril and Methodius who brought Christianity to the southern Slavs, or by their disciples. Paul Cubberley posits that although Cyril may have codified and expanded Glagolitic, it was his students in the First Bulgarian Empire under Tsar Simeon the Great that developed Cyrillic from the Greek letters in the 890s as a more suitable script for church books. Later Cyrillic spread among other Slavic peoples, as well as among non-Slavic Vlachs. Cyrillic and Glagolitic were used for
Glagolitic script By the time of the devastating Italianization movements under Fascist Italy in the early 20th century, numerous independent events had already greatly reduced the area of the liturgical use of Glagolitic. The tradition that the alphabet was designed by Saint Cyril and Saint Methodius has not been universally accepted. A less common belief, contradicting allochthonic Slovene origin, was that the Glagolitic was created or used in the 4th century by St. Jerome (Latin: "Eusebius Sophronius Hieronymus"), hence the alphabet is sometimes named Hieronymian. It is also acrophonically called azbuki from the names of its first two letters in Bulgaria, on