English terms with diacritical marks
The Old English Latin alphabet began to replace the Runic alphabet in the 9th century, due to the influence of Celtic Christian missionaries to the Anglo-Saxon kingdoms. The orthography of Old English – which was entirely handwritten in its own time – was not well standardized, though it did not use all the Latin letters, and included several letters not present in the modern alphabet. When reprinted (on a printing press or computer) in modern times, an overdot is occasionally used with two Latin letters to differentiate sounds for the reader:
Early Cyrillic alphabet
The Early Cyrillic alphabet is a writing system that was developed in the First Bulgarian Empire during the late 9th century on the basis of the Greek alphabet The objective was to make it possible to have Christian service in Slavic tongue, instead of in Greek, which locals did not understand, and to bring Bulgarian subjects closer to the cultural influence of Christianity, the official religion of the Byzantine Empire. It was used by Slavic peoples in South East, Central and Eastern Europe.