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.
In 996, Otto III marched to Italy to claim the titles of King of Italy and Holy Roman Emperor, which had been left unclaimed since the death of Otto II in 983. Otto III also sought to reestablish Imperial control over the city of Rome, which had revolted under the leadership of Crescentius II, and through it the papacy. Crowned as Emperor, Otto III put down the Roman rebellion and installed his cousin as Pope Gregory V, the first pope of German descent. After the Emperor had pardoned him and left the city, Crescentius II again rebelled, deposing Gregory V and installing John XVI as pope. Otto III returned to the city in 998, reinstalled Gregory V, and executed both Crescentius II and John XVI. When Gregory V died in 999, Otto III installed Sylvester II as the new pope. Otto III's actions throughout his life further strengthened imperial control over the Catholic Church.
From the beginning of his reign, Otto III faced opposition from the Slavs along the eastern frontier. Following the death of his father in 983, the Slavs rebelled against imperial control, forcing the Empire to abandon its territories east of the Elbe river. Otto III fought to regain the Empire's lost territories throughout his reign with only limited success. While in the east, Otto III strengthened the Empire's relations with Poland, Bohemia, and Hungary. Through his affairs in Eastern Europe in 1000, he was able to extend the influence of Christianity by supporting mission work in Poland and through the crowning of Stephen I as the first Christian king of Hungary.
Returning to Rome in 1001, Otto faced a rebellion by the Roman aristocracy, which forced him to flee the city. While marching to reclaim the city in 1002, Otto suffered a sudden fever and died in Castle Paterno in Faleria at the age of 21. With no clear heir to succeed him, his early death threw the Empire into political crisis.
Otto was a charismatic figure associated with several legends and notable figures of his time. Opinions on Otto III and his reign vary considerably. Recognized in his own day as a brilliant, energetic, pious leader, Otto was portrayed by nineteenth century historians as a whimsical, overidealistic dreamer who failed in his duty towards Germany. Modern historians generally see him in a positive light, but several facets of the emperor remain enigmatic and debates on the true intentions behind his Imperial Renovation (renovatio imperii Romanorum) program continue.
Otto III was born in June or July 980 somewhere between Aachen and Nijmegen, in modern-day North Rhine-Westphalia. The only son of Emperor Otto II and Empress Theophanu, Otto III was the youngest of the couple's four children. Immediately prior to Otto III's birth, his father had completed military campaigns in France against King Lothar.
On 14 July 982, Otto II's army suffered a crushing defeat against the Muslim Emirate of Sicily at the Battle of Stilo. Otto II had been campaigning in Southern Italy with hopes of annexing the whole of Italy into the Holy Roman Empire. Otto II himself escaped the battle unharmed but many important imperial officials were among the battle's casualties. Following the defeat and at the insistence of the Empire's nobles, Otto II called an assembly of the Imperial Diet in Verona at Pentecost, 983, where he proposed to the assembly to have the three-year-old Otto III elected as king of Germany and Italy, becoming Otto II's undoubted heir apparent. This was the first time a German ruler had been elected on Italian soil. After the assembly was concluded, Otto III traveled across the Alps in order to be crowned at Aachen, the traditional location of the coronation of the German kings. Otto II stayed behind to address military action against the Muslims. While still in central Italy, however, Otto II suddenly died on 7 December 983, and was buried in St. Peter's Basilica in Rome.
Otto III was crowned as king on Christmas Day 983, three weeks after his father's death, by Willigis, the archbishop of Mainz, and by John X, the archbishop of Ravenna. News of Otto II's death first reached Germany shortly after his son's coronation. The unresolved problems in southern Italy and the Slavic uprising on the Empire's eastern border made the Empire's political situation extremely unstable. With a minor on the throne, the Empire was thrown into confusion and Otto III's mother Theophanu assumed the role of regent for her young son.
Otto III's cousin Henry II had been deposed as Duke of Bavaria by Otto II in 976 following his failed rebellion and imprisoned within the Bishopric of Utrecht. Following Otto II's death, Henry was released from prison. As Otto III's nearest male Ottonian relative, Henry II claimed the regency over his infant cousin. Archbishop of Cologne Warin granted Henry II the regency without substantial opposition. Only Otto III's mother Theophanu objected, along with his grandmother, the Dowager Empress Adelaide of Italy, and his aunt, Abbess Matilda of Quedlinburg. Adelaide and Matilda, however, were both in Italy and unable to press their objections.
As regent, Henry II took actions aimed less at guardianship of his infant cousin and more at claiming the throne for himself. According to Gerbert of Aurillac, Henry II adopted a Byzantine-style joint-kingship. Towards the end of 984, Henry II sought to form alliances between himself and other important figures in the Ottonian world, chief among them his cousin King Lothar of France. In exchange for Lothar's agreement to make Henry II king of Germany, Henry II agreed to relinquish Lotharingia to Lothar. The two agreed to join their armies on 1 February 985, in order to take the city of Breisach, but at the last minute, Henry's resolve weakened. Nevertheless, Lothair continued to campaign into German lands and succeeded in overrunning the Verdun by March 985.
Henry II took the young Otto III and traveled to Saxony. There, Henry II invited all the great nobles of the kingdom to celebrate Palm Sunday at Magdeburg for 985. He then campaigned openly for his claim to the German throne, with limited success. Among those who supported his claims were Duke Mieszko I of Poland and Duke Boleslaus II of Bohemia. Henry II was also supported by Archbishop Egbert of Trier, Archbishop Gisilher of Magdeburg, and Bishop Dietrich I of Metz.
Those who opposed Henry II's claims fled to Quedlinburg in Saxony to conspire against him. When he became aware of this conspiracy, he moved his army towards Quedlinburg in hopes of crushing his opposition. Henry II sent Folcmar, the Bishop of Utrecht, ahead of him in order to attempt a peace negotiation between him and the conspirators. The negotiations failed when the conspirators refused to swear allegiance to anyone other than Otto III, with Bernard I, Duke of Saxony, maintaining allegiance to the child king. In response to his failure to gain control over Saxony, Henry II promised to hold future peace negotiations and then headed for the Duchy of Bavaria. With his long-standing familial ties in the region, many bishops and counts recognized him as the rightful heir to the throne. Henry III, Duke of Bavaria, who had been installed as Duke by Otto II, refused to recognize Henry II and remained loyal to Otto III.