Pope Leo III in the context of "Holy Roman Empire"

The Carolingian Empire (800–887) was a Frankish-dominated empire in Western and Central Europe during the Early Middle Ages. It was ruled by the Carolingian dynasty, which had ruled as kings of the Franks since 751 and as kings of the Lombards in Italy from 774. In 800 Pope Leo III crowned King Charlemagne as Roman emperor in return for political protection, disregarding the universalist claims of the weakened Byzantine Empire. The Carolingian Empire is sometimes considered the first phase in the history of the Holy Roman Empire.

After a civil war from 840 to 843 following the death of Emperor Louis the Pious, the empire was divided into autonomous kingdoms, with one king still recognised as emperor but with little authority outside his own kingdom. The unity of the empire and the hereditary right of the Carolingians continued to be acknowledged. In 884 Charles the Fat reunited all the Carolingian kingdoms for the last time, but he was deposed by the Frankish nobility in 887 and died in 888, and the empire immediately fractured. With the only remaining legitimate male of the dynasty a child, the nobility elected regional kings from outside the dynasty or, in the case of the eastern kingdom, an illegitimate Carolingian. The illegitimate line continued to rule in the east until 911, while in the western kingdom the legitimate Carolingian dynasty was restored in 898 and ruled until 987 with an interruption from 922 to 936.

The Catholic Church in France, Gallican Church, or French Catholic Church, is part of the worldwide Catholic Church in communion with the Pope in Rome. Established in the second century in unbroken communion with the bishop of Rome, it is sometimes called the "eldest daughter of the Church" (French: fille aînée de l'Église).

The first written records of Christians in France date from the second century, when Irenaeus detailed the deaths of 90-year-old bishop Saint Pothinus of Lugdunum (Lyon) and other martyrs of the 177 AD persecution in Lyon. In 496 Remigius baptized King Clovis I, who therefore converted from paganism to Catholicism. In 800, Pope Leo III crowned Charlemagne Emperor of the Roman Empire, forming the political and religious foundations of Christendom in Europe and establishing in earnest the French government's long historical association with the Catholic Church. In reaction, the French Revolution (1789–1799) was followed by heavy persecution of the Catholic Church. Since the beginning of the 20th century, Laïcité, absolute neutrality of the state with respect to religious doctrine, is the official policy of the French Republic.

A pope is the Bishop of Rome and the leader of the Catholic Church. Approximately 100 papal tombs are at least partially extant, representing fewer than half of the 266 deceased popes, from Saint Peter to Pope Francis.

For the first few centuries in particular, little is known of the popes and their tombs, and available information is often contradictory. As with other religious relics, multiple sites claim to house the same tomb. Furthermore, many papal tombs that recycled sarcophagi and other materials from earlier tombs were later recycled for their valuable materials or combined with other monuments. For example, the tomb of Pope Leo I was combined with Leos II, III, and IV circa 855, and then removed in the seventeenth century and placed under his own altar, below Alessandro Algardi's relief, Fuga d'Attila. The style of papal tombs has evolved considerably throughout history, tracking trends in the development of church monuments. Notable papal tombs have been commissioned from sculptors such as Michelangelo and Gian Lorenzo Bernini.

The Holy Roman Emperor received the imperial regalia from the hands of the Pope, symbolizing both the pope's right to crown Christian sovereigns and also the emperor's role as protector of the Catholic Church. The Holy Roman Empresses were crowned as well.

The Holy Roman Empire was established in 962 under Otto the Great. Later emperors were crowned by the pope or other Catholic bishops. In 1530 Charles V became the last Holy Roman emperor to be crowned by a pope, Clement VII, albeit in Bologna (Frederick III was the last to be crowned in Rome). Thereafter, until the abolition of the empire in 1806, no further crownings by the pope were held. Later rulers simply proclaimed themselves Imperator Electus Romanorum ("Elected Emperor of the Romans") after their coronation as German king.
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The Throne of Charlemagne (German: Karlsthron or Aachener Königsthron, "Royal Throne of Aachen") is a throne erected in the 790s by Charlemagne, as one of the fittings of his palatine chapel in Aachen (today's Aachen Cathedral) and placed in the Octagon of the church. Until 1531, it served as the coronation throne of the King of the Romans, being used at a total of thirty-one coronations. As a result, especially in the eleventh century, it was referred to as the totius regni archisolium ("Archstool of the Whole Realm"). Charlemagne himself was not crowned on this throne, but instead in the Old St. Peter's Basilica in Rome by Pope Leo III in 800 AD.