Elias of Nisibis was a cleric of the Church of the East, who served as bishop of Beth Nuhadra (1002–1008) and archbishop of Nisibis (1008–1046) (wikipedia). He wrote a number of texts but is best known for Chronography which he composed in the early 11th century CE. Enclclopedia Iranica describes Chronography as follows:
His renowned Chronography on history is preserved in a single manuscript with only a few major lacunae. It is divided into two parts, in Syriac with Arabic translation following each paragraph for most of the first part. The first part, modeled on the Chronicle of Eusebius, treats universal and ecclesiastical history up to 1018 C.E. in the form of tables, usually with accurate references given to the sources. The second part is a manual of the different calendars used in the Orient.