800–899

The 9th century

Whose working lives fell in the 9th century. Books are measured from 1800 and readers from 2015, so for this period we can say who lived then, not who was talked about then.

Lived then

The most notable people whose working lives fell in the 9th century, ranked where Wikipedia coverage and readership agree.

  1. 1Muhammad ibn Musa al-KhwarizmiMuhammad ibn Musa al-Khwarizmi780–850 · Academicsnot measured
  2. 2Muhammad al-BukhariMuhammad al-Bukhari810–870 · Academicsnot measured
  3. 3Al-KindiAl-Kindi801–870 · Academics7 decades
  4. 4Adi ShankaraAdi Shankara788–820 · 🇮🇳 India · Academics0 decades
  5. 5Ahmad ibn HanbalAhmad ibn Hanbal780–855 · Academics2 decades
  6. 6Al-Shafi‘iAl-Shafi‘i767–820 · Academicsnot measured
  7. 7Al-TabariAl-Tabari839–922 · Academics2 decades
  8. 8John Scotus EriugenaJohn Scotus Eriugena800–877 · Academics0 decades
  9. 9KūkaiKūkai774–835 · 🇯🇵 Japan · Academics3 decades
  10. 10BudaiBudai850–916 · Academicsnot measured
  11. 11Hasan al-AskariHasan al-Askari845–874 · Academics0 decades
  12. 12Abu DawoodAbu Dawood817–888 · Academics1 decades
  13. 13Junayd of BaghdadJunayd of Baghdad830–911 · Academics0 decades
  14. 14Linji YixuanLinji Yixuan850–866 · Academicsnot measured
  15. 15Ali al-HadiAli al-Hadi829–868 · Academics0 decades
  16. 16Muhammad al-JawadMuhammad al-Jawad811–835 · Academics0 decades
  17. 17Aal-Yaʿqubi801–905 · Academicsnot measured
  18. 18Ibn QutaybahIbn Qutaybah828–889 · Academics0 decades
  19. 19Abu Mansur al-MaturidiAbu Mansur al-Maturidi852–944 · Academics0 decades
  20. 20IAIbn al-Rawandi827–911 · Academics0 decades
  21. 21Dhu'l-Nun al-MisriDhu'l-Nun al-Misri796–860 · Academicsnot measured
  22. 22AKAbū Kāmil Shujāʿ ibn Aslam850–930 · Academicsnot measured
  23. 23SaichōSaichō767–822 · 🇯🇵 Japan · Academics0 decades
  24. 24AIAli ibn Sahl Rabban al-Tabari838–874 · Academicsnot measured
  25. 25Nicholas MystikosNicholas Mystikos852–925 · Academics0 decades
  26. 26LTLeo the Mathematician790–900 · Academics0 decades
  27. 27RRatramnus800–868 · Academics11 decades
  28. 28INIbn Nusayrdied 883 · Academics0 decades
  29. 29Huangbo XiyunHuangbo Xiyun800–850 · Academics0 decades
  30. 30AAnandavardhana820–890 · 🇮🇳 India · Academics8 decades
  31. 31HAHabash al-Hasib al-Marwazi766–874 · Academicsnot measured
  32. 32RORemigius of Auxerre841–908 · Academics0 decades
  33. 33Ishaq ibn HunaynIshaq ibn Hunayn830–910 · Academics0 decades
  34. 34IAIbn al-Sikkit802–858 · Academics0 decades
  35. 35AIAl-Ḥajjāj ibn Yūsuf ibn Maṭar786–833 · Academicsnot measured
  36. 36AAl-Mahani820–880 · Academics0 decades
  37. 37VasuguptaVasugupta860–925 · Academics0 decades
  38. 38AIAhmad ibn Yusuf835–912 · Academics0 decades
  39. 39'A'Abd al-Hamīd ibn Turk800–900 · Academicsnot measured
  40. 40Han XiangHan Xiangborn 794 · Academics1 decades
  41. 41AAl-Mubarrad826–898 · Academics0 decades
  42. 42MahāvīraMahāvīra817–875 · Academics9 decades
  43. 43AHAbu Hatim Ahmad ibn Hamdan al-Razi801–933 · Academicsnot measured
  44. 44AIAl-Abbās ibn Said al-Jawharī800–860 · Academicsnot measured
  45. 45Guifeng ZongmiGuifeng Zongmi780–841 · Academics0 decades
  46. 46AIAhmad ibn al-Tayyib al-Sarakhsi833–899 · Academicsnot measured
  47. 47VirasenaVirasena792–853 · Academics0 decades
  48. 48Salih ibn Ahmad ibn HanbalSalih ibn Ahmad ibn Hanbal818–879 · Academicsnot measured
  49. 49Miyoshi KiyotsuraMiyoshi Kiyotsura847–919 · 🇯🇵 Japan · Academics0 decades
  50. 50MAMuadh al-Harra800–803 · Academicsnot measured
  51. 51JBJayanta Bhatta850–910 · Academics0 decades

How this is measured

  • Placing people in time. Each person belongs to the century in which they were most active — around age 35, and never after their death.
  • Who ranks highest. Within a century, people are ranked where two independent signals agree: how many of the world’s Wikipedia language editions cover them, and how many people actually read about them. Article counts alone can be lifted by a person’s own circle; readers cannot.
  • Fame in print. The curves count how often a name appears in Google Books from 1800 to 2019, as a share of all the words printed each year, in the person’s own language wherever that corpus exists. Those decades are over, so each measurement is made once and kept.
  • What is left out. A lifetime is measured only from 1820, when there is enough print to judge; the five years after a death are skipped as obituaries; and a name shared with someone equally notable is credited to neither.