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|852 by topic|
|Ab urbe condita||1605|
|Balinese saka calendar||773–774|
|Chinese calendar||辛未年 (Metal Goat)
3548 or 3488
— to —
壬申年 (Water Monkey)
3549 or 3489
|- Vikram Samvat||908–909|
|- Shaka Samvat||773–774|
|- Kali Yuga||3952–3953|
|Japanese calendar||Ninju 2
|Minguo calendar||1060 before ROC
|Seleucid era||1163/1164 AG|
|Thai solar calendar||1394–1395|
978 or 597 or −175
— to —
979 or 598 or −174
|Wikimedia Commons has media related to 852.|
- March 4 – Trpimir I, duke (knez) of Croatia, and founder of the Trpimirović dynasty, issues a first state document in Bijaći of all Slavonic peoples. In this Latin document Trpimir refers to himself as the "duke of the Croats" (dux Chroatorum), and to his country as the "state of the Croats" (regnum Chroatorum).
- Presian I, ruler (khan) of the Bulgarian Empire, dies after a 23-year reign in which the Bulgarians have expanded into Upper Macedonia and Serbia. He is succeeded by his son Boris I, as monarch of Bulgaria.
- Emperor Lothair I and his (half) brother Charles the Bald join forces to remove the Vikings from the island of Oscelles, in the River Seine. After this has failed, Charles again pays them tribute (Danegeld).
- A Viking fleet of 350 vessels enters the Thames Estuary before turning north, and engages the Mercian forces under King Beorhtwulf. The Mercians are defeated, and retreat to their settlements. The Vikings then turn south and cross the river somewhere in Surrey; there they are slaughtered by a West Saxon army, led by King Æthelwulf and his son Aethelbald, at Oak Field (Aclea).
- King Æthelstan, the eldest son of Æthelwulf, is killed by a Viking raiding party. He is succeeded by his brother Æthelberht, who becomes sub-king of Kent, Essex, Surrey and Sussex (approximate date).
- Beorhtwulf dies after a 12-year reign, and is succeeded by his son Burgred as king of Mercia.
- Abd al-Rahman II, Umayyad emir of Córdoba, dies after a 30-year reign in which he has made additions to the Mosque–Cathedral at Córdoba. He is succeeded by his son Muhammad I, who will put down several revolts of the Muladi and Mozarabs in Muslim controlled areas in al-Andalus (modern Spain).
- Abbas ibn Firnas, Muslim physician and inventor, makes a first recorded tower jump in Córdoba. He wraps himself with vulture feathers and attaches two wings to his arms. The alleged attempt to fly is unsuccessful, but the garment slows his fall enough that he only sustains minor injuries.
- March 10 – Qian Liu, Chinese warlord and king (d. 932)
- Bořivoj I, duke of Bohemia (approximate date)
- Nicholas I Mystikos, Byzantine patriarch (d. 925)
- Yang Xingmi, Chinese governor (jiedushi) (d. 905)
- Ermengard of Italy, queen regent of Provence (d. 896)
- Zhang Quanyi, Chinese warlord (d. 926)
- Zhu Wen, emperor of Later Liang (d. 912)
- Abd al-Rahman II, Muslim emir of Córdoba (b. 792)
- Æthelstan, king of Kent (approximate date)
- Aleran, Frankish count and margrave
- Aurelius and Natalia, Christian martyrs
- Beorhtwulf (Bright Wolf), king of Mercia
- Du Mu, Chinese poet and official (b. 803)
- Fredelo, Frankish count (approximate date)
- Harald Klak, king of Denmark (approximate date)
- Íñigo Arista, king of Pamplona (or 851)
- Ishaq ibn Rahwayh, Muslim imam (or 853)
- Lambert II, Frankish count and prefect
- Li Jue, chancellor of the Tang Dynasty
- Presian I, ruler (khan) of the Bulgarian Empire