Frederick sought a decisive solution in Italy in 1166. He marched with a large force to Rome, but a devastating outbreak of malaria among his troops while in the city put an end to the emperor’s plans. In 1167 the Lombard cities formed a league to defend against Frederick’s expedition that included Milan, Venice, Padua, Mantua, Brescia, and Lodi.
Despite his setback, Frederick was determined to stay the course. Indeed, by this time, he could hardly turn back without accepting a near-total surrender. Failing to muster support in Germany, Frederick was forced to rely on the limited resources left to him. On May 29, 1176, he met his enemies at Legnano in northern Italy. The army of the Lombard League, under the leadership of Milan, and Frederick’s army engaged in a pitched battle, in which the supporters of the empire were thoroughly routed. Accepting the realities created by his defeat, Frederick waged a diplomatic campaign that secured the remarkable treaty concluded with Alexander (whom he now recognized as pope) and the Lombard communes in Venice in July 1177. This agreement settled little definitively, but Frederick obtained a six-year truce with the Lombards and was able to hold onto the Mathildine lands in Tuscany for 15 years. He restored his position in Germany and recovered from the losses endured in Rome. In 1183 Frederick converted the truce of Venice into the Peace of Constance, in which he renounced the regalia claimed at Roncaglia but preserved the administrative rights of the crown. From defeat he thus managed to salvage a considerable portion of his imperial power.
Frederick launched his final expedition to Italy in 1184, where he met with Pope Lucius III (1181–85). He also witnessed a diplomatic turnabout on the part of the Norman ruler, William II (1166–89), who espoused his aunt Constance, the daughter of Roger II of Sicily, to Henry, the second son of Frederick. Although Constance was not expected to inherit the Sicilian throne, because William and his queen might still have children, the implications of the agreement were nonetheless momentous. The papacy found itself faced with an intolerable situation. Frederick, now aiming to build a power base in Tuscany instead of Lombardy, attempted to annex the Mathildine lands. Although he failed in this, he secured the spolia (spoils) and regalia of vacant bishoprics and abbacies from Clement III (1187–91). Yet Frederick did not live to consolidate this effort. The defeat of the Crusader army at Ḥaṭṭīn in the Holy Land in July 1187 and the subsequent fall of Jerusalem sent a great shock through the West and inspired the Third Crusade. Frederick took the cross; the kings of England and France followed suit. Frederick Barbarossa drowned in the Saleph River in Anatolia on June 10, 1190. The Crusade was able to save ʿAkko (Acre) and assure the continued Crusader presence in the East, but it left Jerusalem in Muslim hands. Economic and cultural developments
Frederick was the giant of the 12th-century Italian stage. He lived through a period of dramatic social and economic changes. Genoa, Pisa, and Venice became international powers during this period, with commercial interests stretching from northern Europe to Africa and the Levant. The growth of population in both town and countryside brought about an increase in public works, ranging from town walls to canals. The development of guilds and confraternities reflected the growing complexity of economic organization. Even the smallest cities had their professional elite of judges and notaries alongside the nobles, merchants, and craftsmen. The vigour of the economy found its expression in the construction of new and larger cathedrals, the one at Pisa being among the most notable. Overseas trade and investment increased domestic wealth, leading to the embellishment of cities.
Culture, in turn, produced its own coin. In the Norman south, medical studies developed in Salerno. Although the kingdom of Sicily did not become a major centre for the transmission of Byzantine and Islamic cultures to Europe as did Spain, it nonetheless played a significant subsidiary role. Al-Sharīf al-Idrīsī, the famous Arab geographer, dedicated his three major works on geography to Roger II of Sicily. George of Antioch and, later, Eugenius the Admiral were important translators of Greek works into Latin. Capua, Montecassino, Benevento, and Salerno contributed to the Latin cultural tradition from their own rich patrimonies. Historical writing flourished in the hands of Amatus of Montecassino, Romuald of Salerno, Geoffrey Malaterra, and Falco of Benevento. Already in the 11th century an international clerical culture had emerged in the writings of reformers such as Humbert of Silva Candida and Peter Damian, and it grew under the influence of figures such as Bernard of Clairvaux and John of Salisbury. On the local level, Roman civic culture found its expression in clerical circles around the great basilicas and in secular circles around the prefect and, later, the senators. The north produced an early harvest of the civic spirit in the annals of the Genoese Caffaro di Caschifellone and his successors. Although imperial themes often found a place in these cultural developments, underlying loyalties were local. Only slowly did signs of an international lay culture—largely under French influence—emerge. By the late 12th century the whole of Italy had undergone a major economic and cultural transformation that was to provide a rich basis for the 13th century. Henry VI
The death of Frederick Barbarossa’s eldest son, Frederick of Swabia, on the Crusade brought to the German throne his second son, Henry VI (1190–97), who had stayed behind in Germany. Thus, strangely, the son who had not expected to become king and who was husband to a princess who also had not expected to inherit a throne found himself in a position to claim both the German and the Sicilian crowns. In Germany the strength of Henry’s support and the prestige of his father made succession certain, the more so because he defeated his father’s enemy, Henry the Lion, and held his sons hostage. But the Sicilian inheritance of Constance was another matter. The nobility of the kingdom supported the popular Tancred of Lecce (1190–94), as did the English king, Richard I (the Lion-Heart), the old ally of King William II of Sicily. But Henry had secured a promise of imperial coronation from Pope Clement III prior to his death, and his successor, Pope Celestine III (1191–98), who deliberately stalled by engaging in negotiations with Henry, nonetheless proceeded with the coronation on the day following his own consecration. Henry immediately turned his attention to his wife’s Sicilian inheritance, but an outbreak of typhus forced him to abandon his plans and return north. Constance herself was captured and held in Salerno. Pope Celestine declared for Tancred and recognized him as king. In Germany much of the Rhineland joined Richard the Lion-Heart and Celestine against Henry. But the capture of Richard on his return from the Crusade strengthened the emperor’s hand; Henry demanded an enormous ransom and conspired with King Philip II of France to keep Richard a prisoner. When Henry finally reached an agreement with Henry the Lion in the spring of 1194, the way was open for his return to Italy.
Some scholars have speculated that Henry’s Italian policy implies a program of world domination, but such a view is too grandiose. Henry was essentially a practical man. He was also an opportunist. Lacking sources that would provide real insight into his thinking, one can only conclude that he was aware of the policies of his father and that his own aims were extensions, with some modification due to changed circumstance, of those policies. The crown of Sicily was the chief new element. In 1194 he returned to Italy and conquered the Sicilian kingdom; Tancred had died shortly before his campaign began. Aided by the Pisans and Genoese, Henry entered Palermo and was crowned as king on Christmas Day. Constance had remained at Jesi, where she gave birth to a son named Constantine, to be known as Frederick Roger (later Frederick II) in honour of his paternal and maternal grandfathers. Henry aimed to establish German control over the bureaucracy of the Sicilian kingdom and to integrate its administration into that of the empire, employing imperial ministeriales for this purpose. These were originally servants of unfree origin who had risen to become important administrators in the imperial government of the Hohenstaufen. Henry gave the trusted ministerial Markward of Anweiler the duchy of Ravenna and the march of Ancona as hereditary fiefs, thereby ensuring that the land route between the kingdom of Italy and the kingdom of Sicily was in safe hands. These measures reveal the centralizing goals that were at the heart of his vision. He tried to ensure that the German (i.e., imperial) crown would be hereditary in his family, a plan that was on its way to realization when, amid his preparations for a Crusade, he succumbed to typhus in Messina and died on Sept. 28, 1197. In Germany the Hohenstaufen future rested with the efforts of Henry’s younger brother, Philip of Swabia, to secure the succession for Frederick Roger. In the kingdom of Sicily, Constance succeeded immediately and moved to assert her authority. Otto IV