Hadean
The Hadean () is a geologic eon of the Earth pre-dating the Archean. It began with the formation of the Earth about 4.6 billion years ago and ended, as defined by the ICS, 4 billion years ago. , the ICS describes its status as ""informal"". Geologist Preston Cloud coined the term in 1972, originally to label the period before the earliest-known rocks on Earth. W. Brian Harland later coined an almost synonymous term, the "Priscoan period", from "priscus", the Latin word for "ancient". Other, older texts simply refer to the eon as the Pre-Archean.
Abyssinian people
Ge'ez literature is considered to begin with the adoption of Christianity in Ethiopia and Eritrea, as well as the civilization of Axum in the 4th century BCE during the reign of Ezana. While Ge'ez today is extinct and only used for liturgical purposes in the Eritrean Orthodox Tewahedo Church and Ethiopian Orthodox Tewahedo Church, many related Ethiopian Semitic languages continue to be spoken such as Tigre, Tigrinya, Amharic, Harari, Gurage, Zay, Silte, and Argobba. Some of these languages, such as Harari and Tigre, are traditionally written in the Arabic script.