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.
#PersonIn print, 1800–2019Echoed
- 1
Muhammad ibn Musa al-Khwarizmi780–850 · Academicsnot measured— - 2
Muhammad al-Bukhari810–870 · Academicsnot measured— - 3
Al-Kindi801–870 · Academics7 decades - 4
Adi Shankara788–820 · 🇮🇳 India · Academics0 decades - 5
Ahmad ibn Hanbal780–855 · Academics2 decades
- 6
Al-Shafi‘i767–820 · Academicsnot measured—
- 7
Al-Tabari839–922 · Academics2 decades - 8
John Scotus Eriugena800–877 · Academics0 decades - 9
Kūkai774–835 · 🇯🇵 Japan · Academics3 decades - 10
Budai850–916 · Academicsnot measured— - 11
Hasan al-Askari845–874 · Academics0 decades - 12
Abu Dawood817–888 · Academics1 decades - 13
Junayd of Baghdad830–911 · Academics0 decades - 14
Linji Yixuan850–866 · Academicsnot measured— - 15
Ali al-Hadi829–868 · Academics0 decades - 16
Muhammad al-Jawad811–835 · Academics0 decades - 17Aal-Yaʿqubi801–905 · Academicsnot measured—
- 18
Ibn Qutaybah828–889 · Academics0 decades - 19
Abu Mansur al-Maturidi852–944 · Academics0 decades - 20IAIbn al-Rawandi827–911 · Academics0 decades
- 21
Dhu'l-Nun al-Misri796–860 · Academicsnot measured— - 22AKAbū Kāmil Shujāʿ ibn Aslam850–930 · Academicsnot measured—
- 23
Saichō767–822 · 🇯🇵 Japan · Academics0 decades - 24AIAli ibn Sahl Rabban al-Tabari838–874 · Academicsnot measured—
- 25
Nicholas Mystikos852–925 · Academics0 decades - 26LTLeo the Mathematician790–900 · Academics0 decades
- 27RRatramnus800–868 · Academics11 decades
- 28INIbn Nusayrdied 883 · Academics0 decades
- 29
Huangbo Xiyun800–850 · Academics0 decades - 30AAnandavardhana820–890 · 🇮🇳 India · Academics8 decades
- 31HAHabash al-Hasib al-Marwazi766–874 · Academicsnot measured—
- 32RORemigius of Auxerre841–908 · Academics0 decades
- 33
Ishaq ibn Hunayn830–910 · Academics0 decades - 34IAIbn al-Sikkit802–858 · Academics0 decades
- 35AIAl-Ḥajjāj ibn Yūsuf ibn Maṭar786–833 · Academicsnot measured—
- 36AAl-Mahani820–880 · Academics0 decades
- 37
Vasugupta860–925 · Academics0 decades - 38AIAhmad ibn Yusuf835–912 · Academics0 decades
- 39'A'Abd al-Hamīd ibn Turk800–900 · Academicsnot measured—
- 40
Han Xiangborn 794 · Academics1 decades - 41AAl-Mubarrad826–898 · Academics0 decades
- 42
Mahāvīra817–875 · Academics9 decades - 43AHAbu Hatim Ahmad ibn Hamdan al-Razi801–933 · Academicsnot measured—
- 44AIAl-Abbās ibn Said al-Jawharī800–860 · Academicsnot measured—
- 45
Guifeng Zongmi780–841 · Academics0 decades - 46AIAhmad ibn al-Tayyib al-Sarakhsi833–899 · Academicsnot measured—
- 47
Virasena792–853 · Academics0 decades - 48
Salih ibn Ahmad ibn Hanbal818–879 · Academicsnot measured— - 49
Miyoshi Kiyotsura847–919 · 🇯🇵 Japan · Academics0 decades - 50MAMuadh al-Harra800–803 · Academicsnot measured—
- 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.