Parallel (geometry) as a pair of straight lines in a plane which do not meet appears as Definition 23 in Book I of Euclid's Elements. Alternative definitions were discussed by other Greeks, often as part of an attempt to prove the parallel postulate. Proclus attributes a definition of parallel lines as equidistant lines to Posidonius and quotes Geminus in a similar vein. Simplicius also mentions Posidonius' definition as well as its modification by the philosopher Aganis. At the end of the nineteenth century, in England, Euclid's Elements was still the standard textbook in secondary schools. The traditional treatment of geometry was being
History of the Patriarchs of Alexandria H. E. Burmester, in Cairo. In 1713 Eusèbe Renaudot published the Latin translation "Historia patriarcharum alexandrinorum jacobitarum". A scholarly Arabic edition was started by Christian Friedrich Seybold (1904). History of the Patriarchs of Alexandria The History of the Patriarchs of Alexandria is a major historical work of the Coptic Orthodox Church of Alexandria. It is written in Arabic, but draws extensively on Greek and Coptic sources. The compilation was based on earlier biographical sources. It was begun by Severus Ibn al-Muqaffaʿ, although one scholar contests its attribution to him. It was continued by others including Michael, bishop of Tinnis (11th