Heinrich Hagenmeyer (1834–1915) was a German Protestant pastor and historian, specializing in writing and editing texts from the beginning of the Crusades.
Closely associated with fellow German Reinhold Röhricht, their contribution to the history of the kingdom of Jerusalem set a sound archival footing for the discipline.
[2] Hagenmeyer published key critical editions of original sources for the First Crusade, such as the Historia Hierosolymitana of Fulcher of Chartres and the collection of letters composed by the Crusaders.
Hagenmeyer is regarded amongst the group of nineteenth-century historians who "set new scholarly standards in the discovery, appraisal and editing of old and new sources, thereby transforming both content and interpretation of the subject.
"[4] For his contribution to Crusade research, he was awarded an honorary doctorate of philosophy by Heidelberg University.