← 830 850 →

Who was alive in 840?

275 well-known people were alive in 840, including Muḥammad ibn Musa al-Khwarizmi, Louis the Pious, Charles the Bald. Here are the 80 most notable:

• Muḥammad ibn Musa al-Khwarizmi (780–850) — 9th-century Persian mathematician and astronomer
• Louis the Pious (778–840) — King of the Franks
• Charles the Bald (823–877) — King of West Francia from 843 to 877 and Carolingian Emperor from 875 to 877
• Al-Kindi (801–870) — Muslim Arab philosopher, mathematician and physician (c.801–873)
• Gregory IV (795–844) — Pope and bishop of Rome from 827 to 844
• Muḥammad ibn Ismaeel al-Bukhārī (810–870) — Persian Islamic scholar (810-870)
• John VIII (820–882) — Head of the Catholic Church from 872 to 882
• Adrian II (792–872) — pope
• Leo IV (790–855) — pope of the Catholic Church
• Formosus (816–896) — pope
• Ahmad ibn Hanbal (780–855) — Muslim jurist and theologian (780–855)
• Benedict III (810–858) — pope (810-858)
• Marinus I (830–884) — pope
• Nicholas I (820–867) — pope
• John IX (840–900) — pope
• Sergius II (790–847) — pope
• Anastasius III (801–) — pope
• Theodore II (840–897) — pope (840-897)
• Charles the Fat (839–888) — Emperor of the Carolingian Empire (839-888) (r. 881-887)
• Rurik (830–879) — Varangian chieftain (c. 830-879)
• Muslim ibn al-Ḥajjāj (821–875) — Arab Muslim hadith scholar (821–875)
• Lothair I (795–855) — Emperor of the Carolingian Empire from 817 to 855
• Muhammad ibn Jarir al-Tabari (839–922) — Iranian scholar, historian and commentator on the Qur'an (839–923)
• Johannes Scotus Eriugena (800–877) — Irish Catholic philosopher and theologian (c. 800 – c. 877)
• Louis the German (806–876) — King of East Francia from 843 to 876
• Basil I (811–886) — Byzantine emperor from 867 to 886
• Bai Juyi (772–846) — Chinese poet of the Tang Dynasty (772-846)
• Ragnar Lodbrok (801–850) — legendary king of Denmark and Sweden
• Al-Jahiz (775–868) — Arabic writer (776–869)
• Louis II of Italy (825–875) — Ruler of the Holy Roman Empire from 844 to 875
• Abbas Ibn Firnas (810–887) — 9th century astronomer and physician
• Photios I of Constantinople (820–900) — 9th Century Ecumenical Patriarch of Constantinople
• Kenneth MacAlpin (810–858) — King of the Picts
• Michael III (840–867) — Byzantine emperor from 842 to 867
• Michael I Rangabe (770–844) — Byzantine emperor
• Theophilos (813–842) — Byzantine emperor from 829 to 842
• Abd ar-Rahman II (792–852) — Emir of Cordoba from 822 to 852
• Thābit ibn Qurra (836–901) — Mesopotamian astronomer and mathematician
• Einhard (774–840) — Frankish scholar and courtier (c. 775 – 840)
• Al-Mu'tasim (796–842) — 8th Abbasid Caliph. (r. 833–842)
• Abu Isa at-Tirmidhi (825–892) — Islamic hadith scholar (824–892)
• Berengar I of Italy (840–924) — Holy Roman Emperor from 915 to 924
• Domnall mac Ailpín (812–862) — King of the Picts from 858 to 862
• Carloman of Bavaria (830–880) — King of Bavaria from 876 to 879
• Áed mac Cináeda (840–878) — King of the Picts
• Abu Dawud al-Sijistani (817–888) — 9th-century Persian Hadith compiler
• Al-Mutawakkil (822–861) — 10th Abbasid caliph (822–861, r. 847–861)
• Causantín mac Cináeda (836–876) — Scottish king
• Al-Baladhuri (820–892) — Abbasid-era Muslim historian (820-892)
• Boris I of Bulgaria (827–907) — Bulgarian ruler
• Rabanus Maurus (780–856) — archbishop of Mainz and writer (d. 856)
• Theodora (815–867) — 9th-century Byzantine empress, wife of Theophilos
• Clement of Ohrid (840–916) — medieval Bulgarian scholar
• Fatima al-Fihriya (800–880) — Legendary founder of the al-Qarawiyyin mosque
• al-Yaʿqubi (801–905) — 9th-century Arab geographer and historian
• Constantine II of Scotland (801–) — 10th-century king of Scotland (Alba)
• Al-Wathiq (812–847) — 9th Abbasid Caliph (r. 812–847)
• Ibn Khordadbeh (820–912) — Persian geographer and official (died 913)
• Æthelbald (835–860) — King of Wessex
• Lothair II of Lotharingia (835–869) — King of Lotharingia from 855 to 869
• Ansgar (801–865) — missionary to Denmark and later Archbishop of Hamburg-Bremen
• Ibn Majah (824–886) — Persian Hadith compiler (824–886)
• Ali al-Hadi (829–868) — tenth of the Twelve Shia Imams (828–868)
• Æthelberht (836–865) — King of Wessex
• Du Mu (803–852) — Chinese calligrapher, poet and politician (803–852)
• Abu Tammam (805–846) — Muslim Arab poet of Abbasid era (died 850)
• Kassia (810–865) — Byzantine abbess, poet, composer, and hymnographer
• Ono no Komachi (825–900) — Japanese poet
• Louis III the Younger (835–882) — King of East Francia
• Alfonso II of Asturias (759–842) — King of Galicia (c. 760 – 842)
• Abu Ma'shar al-Balkhi (787–886) — Persian astrologer and philosopher (787–886)
• Bayazid Bastami (804–848) — 9th century Persian Sufi mystic
• Álmos, Grand Prince of the Magyars (820–895) — kende or gyula of the Hungarians (fl. 9. century)
• Al-Muhtadi (825–870) — 14th Abbasid Caliph (r. 869–870)
• Ibn Qutaybah (828–889) — Persian jurist and scholar (c.828-889)
• Al-Muntasir (838–862) — 11th Abbasid caliph from 861 to 862
• Emperor Saga (786–842) — Emperor of Japan
• Al-Nasa'i (829–915) — Persian Islamic scholar and collector of hadith (c.829–915)
• Kōkō (830–887) — Emperor of Japan
• Dhu'l-Nun al-Misri (796–860) — Sufi saint

See who was alive and where on the interactive globe →

Explore the full timeline of 24,643 well-known lives →