Barbarian kingdoms in the context of "Migration Period"

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 Kingdom of the Franks (Latin: Regnum Francorum), also known as the Frankish Kingdom or Francia, was the largest post-Roman kingdom in Western Europe. It was established by the Franks, one of the Germanic peoples. Its founder was King Clovis I who united Frankish tribes and expanded the Frankish realm into the Roman Gaul. During the Early Middle Ages, the kingdom was ruled by the Merovingian and Carolingian dynasties. In 800, it evolved into the Carolingian Empire, thus becoming the longest lasting Germanic kingdom from the era of Great Migrations.

Originally, the core Frankish territories inside the former Western Roman Empire were located close to the Rhine and Meuse rivers in the north, but Frankish chiefs such as Chlodio expanded their influence within Roman territory as far as the Somme river in the 5th century.

Odoacer (c. 433 – 15 March 493 AD), also spelled Odovacer or Odovacar, was a barbarian soldier and statesman from the Middle Danube who was an officer of the Roman army and deposed the Western Roman child emperor Romulus Augustulus to become the ruler of Italy (476–493). Odoacer's overthrow of Romulus Augustulus is traditionally understood as marking the end of the Western Roman Empire.

Although he ruled Italy, Odoacer styled himself a client of the Eastern emperor Zeno in Constantinople. He was addressed not only as Latin: rex but also as dux and patrician, the latter title granted by Zeno. In the sole surviving document from his chancery—and by the consul Basilius—Odoacer used the title of king. Backed by the Roman Senate, he distributed land with little resistance. Soldier unrest in 477–478 caused violence, but his later reign was stable. Though an Arian, he seldom interfered in the Trinitarian state church.

The Vandal Kingdom (Latin: Regnum Vandalum) or Kingdom of the Vandals and Alans (Latin: Regnum Vandalorum et Alanorum) was a confederation of Vandals and Alans, which was a barbarian kingdom established under Gaiseric, a Vandalic warlord. It ruled parts of North Africa and the Mediterranean for 99 years from 435 to 534 AD.

In 429 AD, the Vandals, estimated to number 80,000 people, had crossed by boat from Hispania to North Africa. They advanced eastward, conquering the coastal regions of what is now Tunisia, and Algeria. In 435, the Western Roman Empire, then ruling North Africa, allowed the Vandals to settle in the provinces of Numidia and Mauretania when it became clear that the Vandal army could not be defeated by Roman military forces. In 439, the Vandals renewed their advance eastward and captured Carthage, the most important city of North Africa. The fledgling kingdom then conquered the Roman-ruled islands of Mallorca, Sicily, Sardinia, and Corsica in the western Mediterranean. In the 460s, the Romans launched two unsuccessful military expeditions by sea in an attempt to overthrow the Vandals and reclaim North Africa. The conquest of North Africa by the Vandals was a blow to the beleaguered Western Roman Empire, as North Africa was a major source of revenue and a supplier of grain (mostly wheat) to the city of Rome.

The Visigothic Kingdom, Visigothic Spain or Kingdom of the Goths (Latin: Regnum Gothorum) was a barbarian kingdom that occupied what is now southwestern France and the Iberian Peninsula from the 5th to the 8th century. One of the Germanic successor states to the Western Roman Empire, it was originally created by the settlement of the Visigoths under King Wallia in the province of Gallia Aquitania in southwest Gaul by the Roman government and then extended by conquest over all of Hispania. The Kingdom maintained independence from the Eastern Roman or Byzantine Empire, whose attempts to re-establish Roman authority in Hispania were only partially successful and short-lived.

The Visigoths were romanized central Europeans who had moved west from the Danube Valley. They became foederati of Rome, and sought to restore the Roman order against the hordes of Vandals, Alans and Suebi. The Western Roman Empire fell in 476 AD; therefore, the Visigoths believed they had the right to take the territories that Rome had promised in Hispania in exchange for restoring the Roman order. Under King Euric—who eliminated the status of foederati—a triumphal advance of the Visigoths began. Alarmed at Visigoth expansion from Aquitania after victory over the Gallo-Roman and Breton armies at Déols in 469, Western Emperor Anthemius sent a fresh army across the Alps against Euric, who was besieging Arles. The Roman army was crushed at the nearby Battle of Arles, resulting in Euric capturing Arles and secured much of southern Gaul.

King of Italy (Italian: Re d'Italia; Latin: Rex Italiae) was the title given to the ruler of the Kingdom of Italy after the fall of the Western Roman Empire. The first to take the title was Odoacer, a barbarian warlord, in the late 5th century, followed by the Ostrogothic kings up to the mid-6th century. With the Frankish conquest of Italy in the 8th century, the Carolingians assumed the title, which was maintained by subsequent Holy Roman Emperors throughout the Middle Ages. The last Emperor to claim the title was Charles V in the 16th century. During this period, the holders of the title were crowned with the Iron Crown of Lombardy.

A Kingdom of Italy was restored from 1805 to 1814 with Napoleon as its only king, centred in Northern Italy. It was not until the Italian unification in the 1860s that an independent Kingdom of Italy covering the entire Italian Peninsula was restored. From 1861 the House of Savoy held the title of King of Italy until the last king, Umberto II, was exiled in 1946 when Italy became a republic.