Wikipedia
Ruodlieb is a fragmentary romance in Latin verse written by an unknown southern German poet who flourished about 1030. He was almost certainly a monk of the Bavarian abbey of Tegernsee.
The poem is one of the earliest German romances of knightly adventure, and its vivid picture of feudal manners gives it a certain value as a historical document. The poet was probably an eyewitness of the episode (II.4231–5221) which represents the meeting of the Emperor Henry II (d. 1024) with Robert II of France (d. 1031) on the banks of the Meuse River in 1023. Ruodlieb was left unfinished, and furthermore the manuscript was cut up and used for binding books, so that the fragments were only gradually discovered (from 1807 onwards) and pieced together.