Holy Roman emperor in the context of "Ottonian dynasty"

The high medieval Kingdom of Hungary was a regional power in central Europe. It came into existence in Central Europe when Stephen I, Grand Prince of the Hungarians, was crowned king in 1000 or 1001. He reinforced central authority and forced his subjects to accept Christianity. Although all written sources emphasize only the role played by German and Italian knights and clerics in the process, a significant part of the Hungarian vocabulary for agriculture and religion was taken from Slavic languages. Civil wars and pagan uprisings, along with attempts by the Holy Roman emperors to expand their authority over Hungary, jeopardized the new monarchy. The monarchy stabilized during the reigns of Ladislaus I (1077–1095) and Coloman (1095–1116). These rulers occupied Croatia and Dalmatia with the support of a part of the local population. Both realms retained their autonomous position. The successors of Ladislaus and Coloman—especially Béla II (1131–1141), Béla III (1176–1196), Andrew II (1205–1235), and Béla IV (1235–1270)—continued this policy of expansion towards the Balkan Peninsula and the lands east of the Carpathian Mountains, transforming their kingdom into one of the major powers of medieval Europe.

Rich in uncultivated lands, silver, gold, and salt deposits, Hungary became the preferred destination of mainly German, Italian, and French colonists. These immigrants were mostly peasants who settled in villages, but some were craftsmen and merchants, who established most of the cities of the Kingdom. Their arrival played a key role in the shaping of an urban lifestyle, habits, and culture in medieval Hungary. The location of the kingdom at the crossroads of international trade routes favored the coexistence of several cultures. Romanesque, Gothic, and Renaissance buildings and literary works written in Latin prove the predominantly Roman Catholic character of the culture; but Orthodox, and even non-Christian ethnic minority communities also existed. Latin was the language of legislation, administration and the judiciary, but "linguistic pluralism" contributed to the survival of many tongues, including a great variety of Slavic dialects.

The Guelphs and Ghibellines (/ˈɡwɛlfs ... ˈɡɪbɪlaɪnz/ GWELFS ... GHIB-il-ynze, US also /-liːnz, -lɪnz/ -⁠eenz, -⁠inz; Italian: guelfi e ghibellini [ˈɡwɛlfi e ɡibelˈliːni, -fj e -]) were factions supporting the pope (Guelphs) and the Holy Roman emperor (Ghibellines) in the Italian city-states of Central and Northern Italy during the Middle Ages. During the 12th and 13th centuries, rivalry between these two parties dominated political life across Italy. The struggle for power between the Papacy and the Holy Roman Empire arose with the Investiture Controversy, which began in 1075 and ended with the Concordat of Worms in 1122.

Pope Innocent II (Latin: Innocentius II; died 24 September 1143), born Gregorio Papareschi, was head of the Catholic Church and ruler of the Papal States from 14 February 1130 to his death in 1143. His election as pope was controversial, and the first eight years of his reign were marked by a struggle for recognition against the supporters of Anacletus II. He reached an understanding with King Lothair III of Germany, who supported him against Anacletus, and whom he crowned Holy Roman emperor. Innocent went on to preside over the Second Council of the Lateran.

Pope Honorius III (c. 1150 – 18 March 1227), born Cencio Savelli, was head of the Catholic Church and ruler of the Papal States from 18 July 1216 to his death. A canon at the Basilica di Santa Maria Maggiore, he came to hold a number of important administrative positions, including that of Camerlengo. In 1197, he became tutor to the young Frederick II. As pope, he worked to promote the Fifth Crusade, which had been planned under his predecessor, Innocent III. Honorius repeatedly exhorted King Andrew II of Hungary and Emperor Frederick II to fulfill their vows to participate. He also gave approval to the recently formed Dominican and Franciscan religious orders.

The Sixth Crusade (1228–1229), also known as the Crusade of Frederick II, was (like the other Crusades) a military expedition to recapture Jerusalem and the rest of the Holy Land. It began seven years after the failure of the Fifth Crusade and involved very little actual fighting. The diplomatic maneuvering of the Holy Roman emperor and king of Sicily, Frederick II, resulted in the Kingdom of Jerusalem regaining some control over Jerusalem for much of the ensuing fifteen years as well as over other areas of the Holy Land. Frederick II's negotiations and power-sharing agreement and negotiation with envoys from al-Malik Al-Kamil of Egypt, which led to a shared Christian-Muslim governance situation in Jerusalem, made this Crusade different from the others (and some call it the only successful one). Frederick II carried out his maneuvers in 1228 while under excommunication from the Church by Pope Gregory IX.

Otto III (June/July 980 – 23 January 1002) was the Holy Roman emperor and King of Italy from 996 until his death in 1002. A member of the Ottonian dynasty, Otto III was the only son of Emperor Otto II and his wife Theophanu.

Otto III was crowned as King of Germany in 983 at the age of three, shortly after his father's death in Southern Italy while campaigning against the Byzantine Empire and the Emirate of Sicily. Though the nominal ruler of Germany, Otto III's minor status ensured his various regents held power over the Empire. His cousin Duke Henry II of Bavaria, initially claimed regency over the young king and attempted to seize the throne for himself in 984. When his rebellion failed to gain the support of Germany's aristocracy, Henry II was forced to abandon his claims to the throne and to allow Otto III's mother Theophanu to serve as regent until her death in 991. Otto III was then still a child, so his grandmother, Adelaide of Italy, served as regent until 994.