{"id":"euclid","domain":"geometry","type":"Person","title":"Euclid","slug":"euclid","url":"/mathematics/geometry/euclid/","active":"c. 300 BCE","location":"Alexandria, Egypt","summary":"Greek mathematician, author of the Elements, the most influential mathematics textbook in history. Almost nothing is known of his personal biography.","added_to_codex":"2026-05-27","last_verified":"2026-05-27","sources":[{"tier":1,"citation":"Heath, T.L. (1956). Euclid: The Thirteen Books of the Elements. Vol. 1, Introduction. Dover."},{"tier":1,"citation":"Netz, R. (1999). The Shaping of Deduction in Greek Mathematics. Cambridge University Press."},{"tier":2,"citation":"O'Connor, J.J. and Robertson, E.F. (1999). Euclid of Alexandria. MacTutor.","url":"https://mathshistory.st-andrews.ac.uk/Biographies/Euclid/"},{"tier":2,"citation":"Taisbak, C.M. (2003). Euclid's Data. Museum Tusculanum Press."}],"relationships":[{"type":"major_work","target":"euclids-elements","label":"Euclid's Elements"},{"type":"contemporary_of","target":"archimedes","label":"Archimedes"}],"entry_status":"live","reading_levels_available":["curious","exploring","deep_dive"],"completeness":1.0,"codex_version":"1.3"}