The Deeds of the Emperor Frederick on the Holy Expedition ("Gesta Federici in expeditione sacra") is a short, anonymous Latin account of Frederick Barbarossa's campaign on the Third Crusade (1189–1190). It was probably written in Italy in the 1190s.
The "Deeds" did not circulate widely. It survives in two manuscripts. In Paris, Bibliothèque nationale de France, MS lat. 4931, it takes up eight columns across three folios (105d–107c). In both manuscripts, it is found alongside a longer text about Frederick, the "Narration of the Oppression and Subjection of Lombardy", an account of the war with the Lombard League culminating in the battle of Legnano in 1176. This was written shortly after the treaty of Venice in 1177. Ronald Witt suggests that the two may have been written by the same person. Both these texts together were adapted several times by later Italian writers.
The "Deeds" contains little that is not found in other more substantial sources, such as the "History of the Expedition of the Emperor Frederick" and the "History of the Pilgrims". It is possible that the author of the "Deeds" had access to the "History of the Pilgrims", since in a few cases he uses very similar wording. It is almost certain that he had access to some of the same letters that the authors of the longer accounts did. His account was used by Sicard of Cremona for his chronicle.
The "Deeds" may occasionally clarify a reading of the "Histories" or resolve a discrepancy between them. Although modern estimates put Frederick's crusader army at about 15,000 men, the "Deeds" gives its size as "90,000 armed warriors". Its account of how the army was guided by a Turk to take a road through the Taurus Mountains and avoid the Via Sebaste differs from the others, all of which present the Turk as a prisoner acting under compulsion. According to the "Deeds", however, the Turk was an emir who volunteered his services knowing that the emperor could have him beheaded if it turned out he was lying.
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