3. Euclid's biography

Heath, History p. 354: Proclus (410-485, an Athenian philosopher, head of the Platonic school) on Eucl. I, p. 68-20:

Heath, History p. 357: Latin author, Stobaeus (5th Century A.D.):

Sarton, p. 19: Athenian philosopher, Proclus (410 A.D. - 485): Ptolemy I, king of Egypt, asked Euclid "if there was in geometry any shorter way than that of the Elements, and he answered that there was no royal road to geometry."

Heath, History p. 355: Arabian author, al-Qifti (d. 1248):

Heath notes that ancient Arabian scholars describe many important Greek scholars as Arabian.

Heath, History p. 356: Pappus (end of 3rd Century A.D.): Apollonius [another mathematician] "spent a very long time with the pupils of Euclid at Alexandria"; also: "The four books of Euclid's Conics were completed by Apollonius, who added four more and gave us eight."

Heath, The Thirteen Books of the Elements, p. 6: The Arabians pronounced Euclides "Uclides" and thought his name came from two Arabic words: Ucli, which means "key," and Dis, which means "measurement." They thought Euclid's name meant, essentially, "key to geometry."