Cyrillic script of Bulgaria to the European Union on 1 January 2007, Cyrillic became the third official script of the European Union, following Latin and Greek. Cyrillic is derived from the Greek uncial script, augmented by letters from the older Glagolitic alphabet, including some ligatures. These additional letters were used for Old Church Slavonic sounds not found in Greek. The script is named in honor of the two Byzantine brothers, Saints Cyril and Methodius, who created the Glagolitic alphabet earlier on. Modern scholars believe that Cyrillic was developed and formalized by early disciples of Cyril and Methodius. In the early 18th century,
Latin-script alphabet respective alphabet sequences. In some languages, digraphs are included in the collation sequence (e.g. Hungarian CS, Welsh RH). The International Phonetic Alphabet is also derived mainly from the Latin script. Coverage of the letters of the ISO basic Latin alphabet can be and additional letters can be Most alphabets have the letters of the ISO basic Latin alphabet in the same order as that alphabet. Some alphabets regard digraphs as distinct letters, e.g. the old Spanish alphabet had CH and LL sorted apart from C and L. Some Spanish dictionaries still list "ll" separately. Some alphabets sort letters that have