The first three decades of Charlemagne’s reign were characterized by extensive military campaigning. His campaign against the Saxons proved to be his most difficult and long-lasting one. After thirty years of on-again, off-again fighting, betrayed truces, and bloody reprisals enacted by the Franks, the Saxons finally submitted in 804. Charlemagne’s activities in Saxony were accompanied by simultaneous campaigns in Italy, Bavaria, and Spain—the last of which ended in a resounding defeat for the Franks and was later mythologized in the 11th-century French epic The Song of Roland. Nonetheless, Charlemagne’s reputation as a warrior king was well earned, and he had expanded his domain to cover much of western Europe by the end of his reign.