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
Reign: The Conqueror prefer to create there, Alexandria. Alexander has a vision of himself being in Alexandria 100 years after his death where he visits the place where he was entombed by Ptolemy. Before leaving Egypt Alexander and his men visit the Temple of Ammon where they are told that Alexander will be killed by the one he trusts the most. Ptolemy witnesses a separate prophecy, that he will become Great King of the World. Plotting with Persia, Pythagorean cult members make another attempt on Alexander's life but he is able to fight them off. Darius leads Persia's armies against Macedonia's. Aristotle meanwhile