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Arechis II (also Aretchis, Arichis, Arechi or Aregis) (born c. 734 - died 26 August 787) was a Duke of Benevento, in Southern Italy. He sought to expand the Beneventos' influence into areas of Italy that were still under Byzantine control, but he also had to defend against Charlemagne, who had conquered northern Italy.
Arechis was descended from the Lombards, who had invaded the Italian peninsula in the late sixth century. The Lombards established their kingdom in northern Italy. Its capital was at Pavia, and it also included two independent southern duchies—the Spoleto and Benevento.
Arechis was the son of Duke Liutprand, whom he succeeded in 756. Arechis continued to use the title duke of Benevento until the Lombard kingdom fell to Charlemagne in 774. Arechis adopted the title prince of Benevento after the fall of the kingdom—probably as a gesture of independence—and continued to use it until his death in 787.
Around 757, Arechis married Adelperga, a daughter of the northern Lombard king Desiderius. Arechis established friendly—but largely independent—relations with Desiderius. This lasted until 774, when the Lombard kingdom fell to the Franks and Desiderius was deposed. The Beneventan couple produced five children: three boys and two girls.
By eighth century standards, Adelperga and Arechis were notable patrons of culture. Adelperga commissioned the major Lombard writer Paul the Deacon to produce his Historia Romana, a textbook of Roman history which was widely used during the rest of the Middle Ages. Some historians also argue that they commissioned Paul's more famous Historia gentis Langobardorum although this is uncertain. Arechis arranged for the transfer of saints' relics to the newly commissioned church of Santa Sofia in Benevento. The church still survives, albeit heavily restored. It is decorated with rare eighth-century frescoes.
Arechis also put resources into building projects in Salerno, including a new palace and castle. Salerno became an increasingly important port city during Arechis' reign. Major southern monasteries, such as Montecassino and San Vincenzo al Volturno also received substantial donations from him.
Arechis was duke when Charlemagne conquered the north Italian Lombard kingdom in 774. Although Arechis refused to submit when Charlemagne made himself king of the Lombards, Benevento was left largely unmolested. In the same year Arechis adopted the title of "prince of Benevento". He also issued a handful of laws. Both these acts were probably intended as a gesture of defiance against Charlemagne—until this time only the Lombard kings had enacted laws. Since Charlemagne now styled himself king of the Lombards, Arechis was effectively rejecting Charlemagne's right to this title.
In 776, Arechis was probably involved in a Lombard conspiracy to throw off Frankish domination. Charlemagne successfully crushed this revolt, which was mostly focused in northeastern Friuli. Arechis does not seem to have provided much practical support for the rebellion and Charlemagne was forced to hurry back north of the Alps, rather than dealing with Arechis. Once again, geographical distance had protected Arechis from the Franks.
Arechis' Beneventan state continued to skirmish with and try to seize territory from the neighbouring Byzantine duchy of Naples. At some point, however, perhaps in the mid-780s, Arechis reached an agreement with the duke of Naples set out in a document called a pactum. This agreement sets forth detailed provisions dealing with landholding and dispute settlement. It may have been intended to relieve Benevento, which was facing the looming Frankish threat.
This crystallised in 787, when Charlemagne advanced into south Italy and besieged Capua, an important town in the principality of Benevento. Arechis left Benevento itself and retreated to his new centre, the port of Salerno. Under pressure, Arechis apparently submitted to Frankish suzerainty. As Einhard, Charlemagne's biographer, describes it in his Vita Caroli Magni:
He [Charlemagne] afterwards entered Italy in person with his army , and passed through Rome to Capua, a city in Campania, where he pitched his camp and threatened the Beneventans with hostilities unless they should submit themselves to him. Their duke, Aragis, escaped the danger by sending his two sons, Rumold and Grimold, with a great sum of money to meet the King, begging him to accept them as hostages, and promising for himself and his people compliance with all the King's commands, on the single condition that his personal attendance should not be required. The King took the welfare of the people into account rather than the stubborn disposition of the Duke, accepted the proffered hostages, and released him from the obligation to appear before him in consideration of his handsome gift. He retained the younger son only as hostage, and sent the elder back to his father, and returned to Rome, leaving commissioners with Aragis to exact the oath of allegiance, and administer it to the Beneventans. He stayed in Rome several days in order to pay his devotions at the holy places, and then came back to Gaul .
Superficially, Charlemagne seemed to have imposed himself on Benevento. Arechis had paid tribute and one of his sons was being held hostage as a guarantee of Benevento's loyalty. Frankish influence was also given formal expression. Traditionally Benevento had produced and used gold coinage, but from 787 the Beneventan mint began to strike silver coins too. The new coins were similar to those issued by Charlemagne's Frankish kingdom. Both the new silver and the traditional gold coins, as well as Beneventan legal documents, all started to include Charlemagne's name and title alongside those of Arechis. The inclusion of titles on coins and in charters was considered an important marker of political authority.
However, Einhard overstates Charlemagne's success. Frankish influence in Benevento proved to be very short-lived. In 788, both Grimoald's elder brother, Romuald, and Arechis himself died. Grimoald III, who was being held hostage by Charlemagne, succeeded as prince of Benevento. Unwisely, Charlemagne released Grimoald in return for an oath of loyalty. Grimoald did not keep his promise; by c. 791, he had effectively proclaimed himself independent and successfully resisted the Franks. Grimoald later tried to throw off Frankish suzerainty, but Charlemagne's sons, Pepin of Italy and Charles the Younger, forced him to submit in 792.