Лев IX
In 1053 it is likely that Pope Leo IX used Guardialfiera as a base in order to launch an attack against the Normans who had occupied the nearby town of Larino in 1050. On June 18, 1053 the Norman Count of Apulia, Humphrey of Hauteville defeated Pope Leo IX at the Battle of Civitate. The Episcopal Seat of Guardialfiera was established in 1061 by Pope Alexander II likely in recognition of the town's role in the events of 1053.