Sachsenkriege Karls des Großen
The first major devastation occurred in 774, during Charlemagne's Saxon Wars. While the king was in Italy, the Saxons invaded Hesse and besieged Büraburg, where the population of Fritzlar had sought refuge. Failing to take the fortress, the Saxons destroyed Fritzlar, but not St. Wigbert's stone basilica. This gave rise to the legend that two angels had appeared to chase away the invaders and protect the church.