|Covid-19|Driven by tensions between his favoured Turkish guard and the populace of Baghdad, Abbasid caliph al-Mu'tasim moves his residence to the new city of Samarra, 130 km north of Baghdad. With brief interruptions, the city will remain the seat of the Abbasid caliphs until 892.
Danish Vikings arrive in West Saxon, North Devon and Somerset. King Egbert of Wessex fights them at the Battle of Carhampton, but he is forced to withdraw.
July 4 – Pactum Sicardi: Prince Sicard of Benevento signs a 5-year armistice with the duchies of Sorrento, Naples and Amalfi. He recognizes the trade of merchants between the three cities in Southern Italy.
Malamir, ruler (khan) of the Bulgarian Empire, dies after a 4-year reign and is succeeded by his nephew Presian I. Because of his young age and inexperience, the Bulgarian state affairs are dominated by his minister and commander-in-chief Isbul.
Pietro Tradonico is appointed doge of Venice (until 864).
The Basilica of St. Castor in Koblenz (Rhineland-Pfalz) is constructed.
The oldest known mention is made of the city of Soest (modern Germany).
Æthelberht, king of Wessex (approximate date)
Al-Musta'in, Muslim caliph (d. 866)
Fujiwara no Mototsune, Japanese regent (d. 891)
Ibn al-Rumi, Muslim poet (d. 896)
Luo Hongxin, Chinese warlord (d. 898)
Mihira Bhoja, king of the Gurjara-Pratihara Dynasty (d. 885)
Wei Zhuang, Chinese poet (approximate date)
March 17 – Haito, bishop of Basel
Adalram, archbishop of Salzburg
Aznar Sánchez, duke of Gascony
Herefrith, bishop of Winchester
Heungdeok, king of Silla (b. 777)
Lambert I, Frankish nobleman
Malamir, ruler of the Bulgarian Empire
Matfrid, Frankish nobleman
Muhammad ibn Idris, emir of Morocco
Nicetas the Patrician, Byzantine official
Prosigoj, Serbian prince (approximate date)
Ralpacan, emperor of Tibet (b. 802)
Wala of Corbie, Frankish nobleman
Wang Zhixing, general of the Tang Dynasty (b. 758)
Year 836 (DCCCXXXVI) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar.