Pope John XII in the context of "Saeculum obscurum"

The Holy Roman Empire, also known as the Holy Roman Empire of the German Nation after 1512, was a polity in Central and Western Europe, usually headed by the Holy Roman Emperor. It developed in the Early Middle Ages (beginning in either 800 or 924), and lasted for a millennium until its dissolution in 1806 during the Napoleonic Wars. Initially, it comprised three constituent kingdoms—Germany, Italy, and, from 1032, Burgundy—held together by the emperor's overlordship. By the 15th century, imperial governance became concentrated in the Kingdom of Germany, as the empire's effective control over Italy and Burgundy had largely disappeared.

On 25 December 800, Pope Leo III crowned the Frankish king Charlemagne Roman emperor, reviving the title more than three centuries after the fall of the Western Roman Empire in 476. The title lapsed in 924, but was revived in 962 when Otto I was crowned emperor by Pope John XII, as Charlemagne's and the Carolingian Empire's successor. From 962 until the 12th century, the empire was one of the most powerful monarchies in Europe. It depended on cooperation between emperors and vassals; this was disturbed during the Salian period. The empire reached the apex of territorial expansion and power under the House of Hohenstaufen in the mid-13th century, but overextension led to a partial collapse. The imperial office was traditionally elective by the mostly German prince-electors. In theory and diplomacy, the emperors were considered the first among equals of all of Europe's Catholic monarchs.

In the Middle Ages, the term universal power referred to the Holy Roman Emperor and the Pope. Both were struggling for the so-called dominium mundi, or world dominion, in terms of political and spiritual supremacy.

The universal powers continued into the early 19th century until the Napoleonic Wars. The reshaping of Europe meant the effective end of the Empire. Although the Papacy had its territorial limits confined to the Vatican, it retained its soft power in the contemporary world.

Pope Benedict VIII (Latin: Benedictus VIII; c. 980 – 9 April 1024) was bishop of Rome and ruler of the Papal States from 18 May 1012 until his death. He was born Theophylact of Tusculum to the noble family of the counts of Tusculum. Unusually for a medieval pope, he had strong authority both in Rome and abroad.

Theophylact was born to Count Gregory I of Tusculum. The family had already produced three popes: John XI (r. 931–935), John XII (r. 955–964), and Benedict VII (r. 973–974). Theophylact became pope on 18 May 1012 and took the name Benedict VIII.

Adelaide of Italy (German: Adelheid; 931 – 16 December 999 AD), also called Adelaide of Burgundy, was Holy Roman Empress by marriage to Emperor Otto the Great. She was crowned with him by Pope John XII in Rome on 2 February 962. She was the first German queen more consistently designated as consors regni, denoting a "co-bearer of royalty" who shared power with her husband. She was essential as a model for future consorts regarding both status and political influence. She was regent of the Holy Roman Empire as the guardian of her grandson in 991–995.

Pope Leo VIII (c. 915 – 1 March 965) was a Roman prelate who claimed the Holy See from 963 until 964 in opposition to John XII and Benedict V and again from 23 June 964 to his death. Today, he is considered by the Catholic Church to have been an antipope during the first period and the legitimate pope during the second. An appointee of Holy Roman Emperor Otto I, Leo VIII's pontificate occurred after the period known as the saeculum obscurum.

A collection of popes have had violent deaths through the centuries. The circumstances have ranged from martyrdom (Pope Stephen I) to war (Lucius II), to an alleged beating by a jealous husband (Pope John XII). A number of other popes have died under circumstances that some believe to be murder, but for which definitive evidence has not been found.