The Wagri, Wagiri, or Wagrians were a tribe of Polabian Slavs inhabiting Wagria, or eastern Holstein in northern Germany, from the ninth to twelfth centuries.
In 1066, the Wagri allied with the Wilzi in storming the line of Saxon burgwarden from Mecklenburg to Schwerin and into German territory as deep as Hamburg.
In 1093, the Christian Obodrites under Henry, aided by some Saxons and the local Low German population, defeated Kruto at the Battle of Schmilau near Ratzeburg.
Vicelin of Oldenburg, a Christian priest, first began to evangelise the Wagri and Wilzi with the permission of Henry, who was reigning from Lübeck, around 1126.
In the years which followed Vicelin's mission, the Emperor Lothair II thoroughly encastellated Wagria and Canute Lavard and the Holsteiners invaded it and took Pribislav and Niklot, the Wagrian leaders, away in chains.