Bruno of Querfurt, O.S.B. Cam.,, also known as Brun, was a Christian missionary bishop, Camaldolese monk and martyr, who was beheaded near the border of Kievan Rus and Lithuania for trying to spread Christianity. He is also called the second "Apostle of the Prussians".

The Annals of Quedlinburg were written between 1008 and 1030 in the convent of Quedlinburg Abbey. In recent years a consensus has emerged that it is likely that the annalist was a woman. The annals are mostly dedicated to the history of the Holy Roman Empire; they also contain the first written mention of the name of Lithuania ("Litua"), in a description of an event dated to March 1009. The original document has disappeared, surviving only as a 16th-century copy held in Dresden, but its contents endure as a scholarly resource.