Editing 852 (section)

==== Europe ====
* [[March 4]] &ndash; [[Trpimir I of Croatia|Trpimir I]], duke (''[[Knyaz|knez]]'') of [[Duchy of Croatia|Croatia]], and founder of the [[Trpimirović dynasty]], issues a first state document in [[Bijaći]] of all [[Slavs|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 of Bulgaria|Presian I]], ruler (''[[Khan (title)|khan]]'') of the [[First Bulgarian Empire|Bulgarian Empire]], dies after a 23-year reign in which the [[Bulgars|Bulgarians]] have expanded into [[Upper Macedonia]] and [[Serbia]]. He is succeeded by his son [[Boris I of Bulgaria|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 [[Oissel|Oscelles]], in the [[Seine|River Seine]]. After this fails, Charles again pays them [[tribute]] ([[Danegeld]]).