Donation of Pepin in the context of "Abbot"

The Papal States (/ˈpeɪpəl/ PAY-pəl; Italian: Stato Pontificio; Latin: Dicio Pontificia), officially the State of the Church, were a conglomeration of territories on the Italian peninsula under the direct sovereign rule of the pope from 756 to 1870. They were among the major states of Italy from the 8th century until the unification of Italy, which took place between 1859 and 1870, culminating in their demise.

The state was legally established in the 8th century when Pepin the Short, king of the Franks, gave Pope Stephen II, as a temporal sovereign, lands formerly held by Arian Christian Lombards, adding them to lands and other real estate formerly acquired and held by the bishops of Rome as landlords from the time of Constantine onward. This donation came about as part of a process whereby the popes began to turn away from the Byzantine emperors as their foremost temporal guardians for reasons such as increased imperial taxes, disagreement with respect to iconoclasm, and failure of the emperors, or their exarchs in Italy, to protect Rome and the rest of the peninsula from barbarian invasion and pillage.

The capture of Rome (Italian: Presa di Roma) occurred on 20 September 1870, as forces of the Kingdom of Italy took control of the city and of the Papal States. After a plebiscite held on 2 October 1870, Rome was officially made capital of Italy on 3 February 1871, completing the unification of Italy (Risorgimento).

The capture of Rome by the Royal Italian Army brought an end to the Papal States, which had existed since the Donation of Pepin in 756, along with the temporal power of the Holy See, and led to the establishment of Rome as the capital of unified Italy. It is widely commemorated in Italy, especially in cathedral cities, by naming streets for the date: Via XX Settembre (spoken form: "Via Venti Settembre").

Pope Stephen II (Latin: Stephanus II; 714 – 26 April 757) was born a Roman aristocrat and member of the Orsini family. Stephen was the bishop of Rome from 26 March 752 to his death on 26 April 757. Stephen II marks the historical delineation between the Byzantine Papacy and the Frankish Papacy. During Stephen's pontificate, Rome was facing invasion by the Lombards when Stephen II went to Paris to seek assistance from Pepin the Short. Pepin defeated the Lombards and made a gift of land to the pope, eventually leading to the establishment of the Papal States.

Langobardia Major was the name that, in the Early Middle Ages, was given to the domains of the Lombard Kingdom in Northern Italy. It comprised Lombardy proper with its capital Pavia, the Duchies of Friuli and Trent as well as the Tuscany region. In the south, it was bordered by the Patrimonium Sancti Petri, which would become the Papal States following the 754 Donation of Pepin, stretching from the Tyrrhenian to the Adriatic Sea. The Lombard territories further to the south were called Langobardia Minor, consisting of the Duchies of Spoleto and Benevento.

Langobardia Major was internally divided into eastern Austria, western Neustria and Tuscia. After the domains had been conquered by Charlemagne at the 774 Siege of Pavia, they became part of the Carolingian Empire.

In the history of the Papacy, the Frankish Papacy (756–857) was a period marked by a shifting of influence from the Byzantine Empire (i.e. the Byzantine Papacy) to that of the kings of the Franks. Pepin the Short (ruled 751–768), Charlemagne (r. 768–814) (co-ruler with his brother Carloman I until 771), and Louis the Pious (r. 814–840) had considerable influence in the selection and administration of popes. The "Donation of Pepin" (756) ratified a new period of papal rule in central Italy, which became known as the Papal States.

This shift was initiated by the Lombards conquering the Exarchate of Ravenna from the Byzantines, strengthened by the Frankish triumph over the Lombards, and ended by the fragmentation of the Frankish Kingdom into West Francia, Middle Francia, and East Francia. Lothair I continued to rule Middle Francia which included much of the Italian peninsula, from 843 to 855.