.
Consolidation of power Theophanu ruled the Holy Roman Empire as regent for a span of five years, from May 985 to her death in 991, despite early opposition by the Ottonian court. In fact, many queens in the tenth century, on an account of male rulers dying early deaths, found themselves in power, creating an age of greater diversity. Her power as queen, empress and regent was based on the basis of Saxon tradition (which assigned the women an equal role in the family), Byzantine influence (which presented a model of a female counterpart to the emperor) and her mother-in-law Adelaide's legacy. Theophanu and her mother-in-law, Adelaide, are known during the empress' regency to have butted heads frequently—
Adelaide of Italy is even quoted as referring to her as "that Greek empress." However, according to historian and author Simon Maclean, Theophanu's rivalry with her mother-in-law is overstated. Theophanu's "Greekness" was not an overall issue. Moreover, there was a grand fascination with the culture surrounding Byzantine court in the west that slighted most criticisms to her Greek origin. Theophanu's regency is a time of considerable peace, as the years 985-991 passed without major crises.
Policy In the North, she made a treaty with King
Eric the Victorious, which promoted an alliance against Slavic tribes as well as reinforced trade and cultural connections. In the East, she sent envoys to
Vladimir the Great of Kiev, who was married to the Byzantine princess Anna, sister of Emperor
Basil II. Economou notes that, "Theophano had in mind a 'family of kings,' in parallel to Byzantine tradition: The emperor was the 'father' of other kings, who were his 'sons' and 'friends' (amici) in a kind of family hierarchy. She also adopted the Byzantine model of relations between the emperor and patriarch in her relations to the pope (Ostrogorsky 1956b). The 'family' of the western empire included the duke of Poland,
Mieszko I, Bohemia and Hungary". Her model of imperial rulership, influenced by Byzantine and Ancient Roman ideas, was taken over by Otto II and especially Otto III who developed it further (although his abrupt death at a very young age prevented it from becoming an established foundation for the future). According to historian
Gerd Althoff, Theophanu's prowess in diplomacy could be exaggerated. Royal charters present evidence that magnates were at the core of governing the empire. Althoff highlights this as unusual, since kings or emperors in the middle ages rarely shared such a large beacon of power with nobility. Theophanu introduced Byzantine protocol, "which influenced dress, crowns and jewelry, eating habits and utensils, even furniture". Her retinue of scholars brought to the empire Byzantine lawyers' procedures. The cult of Saint Nicholas in the empire traces its origin from her too. ,
Cologne. As she and her husband and her son promoted trade in the Empire,
Magdeburg and its traders were granted various privileges. Historical evidences show strong commercial activities in regions from
Lüneburg to
Halle. There are traces of Byzantine, Slavic as well as Arab traders. As with many Byzantine monarchs, Theophanu preferred diplomacy, but she did wage wars when necessary and accepted personal risk. She carried out at least one (successful) military expedition herself, in 987, when she marched with an imperial army to assist the Prince-Bishop
Notker of Liège against
Odo I, Count of Blois. Due to illness beginning in 988, Theophanu eventually died at
Nijmegen and was buried in the
Church of St. Pantaleon near her
wittum in
Cologne in 991. The chronicler
Thietmar eulogized her as follows: "
Though [Theophanu] was of the weak sex she possessed moderation, trustworthiness, and good manners. In this way she protected with male vigilance the royal power for her son, friendly with all those who were honest, but with terrifying superiority against rebels." Because Otto III was still a child, his grandmother
Adelaide of Italy took over the regency until Otto III became old enough to rule on his own. ==Historiography and depictions in arts==