The Book of Kells, c. AD 800, is lettered in a script known as "insular majuscule", a variety of uncial script that originated in Ireland.
In a Western context, Uncial is a majuscule[1]script (written entirely in capital letters) commonly used from the 4th to 8th centuries AD by Latin and Greekscribes.[2]
Uncial letters were used to write Greek and Latin, as well as Gothic, and are the current style for Coptic and Nobiin.
In a Slavic context, Uncial/Ustav and Semi-Uncial/Poluustav scripts were used from the 9th to the 17th century AD to write the Slavic languages in Cyrillic. It can still be used today in academic or religious publications.
Slavic professors use also the english terms[3] even if the comparison to the Western European style is considered inadequate by some palaeographers.[4] Indeed the Greek ustav, a separate category in Slavic terminology[5] is often combined with uncial writing because in some European languages, the "ustav" and the uncial (as well as the semi-ustav and semi-uncial) are generally called the same word.
^English wiktionary, Usage notes for the word ustav: "Ustav and poluustav writing is often referred to as Cyrillic uncial and semi-uncial script, but the comparison to the Western European style is considered inadequate by some palaeographers, so the Slavic words are also used in English-language writing."
^"... In the Byzantine period, from the IV—V centuries AD, this [uncial] handwriting passed into the "ustav", which was used most often for church books..." (Istrin 1965, p. 350). «…В византийский период, с IV—V вв. н. э., почерк этот [унциал] перешел в „устав“, применявшийся чаще всего для церковных книг…» (Истрин 1965, стр. 350).