Rustic capitals were used for ordinary writing, e.g., election slogans on the building walls of Pompeii. Different forms of each letter are just stylistic varia

Rustic capitals were used for ordinary writing, e.g., election slogans on the building walls of Pompeii. Different forms of each letter are just stylistic variations between scribes, or contextual variations (the third 'G', for example, would only be used on the last line of text). Latin had a very regular orthography: with the exceptions of I/J and U/V, and digraphs used to transliterate Greek, all letters had exactly one pronunciation. The distinctions between I and J, and between U and V, are mediaeval innovations to aid literacy.