Theophano

…state and the 20-year-old empress, Theophano, as acting regent for the legitimate emperors, Basil and Constantine, aged six and three, respectively. These circumstances do not seem to have tempted Nicephorus.

…the young king, whose mother, Theophano, controlled the regency until her death in 991. Otto’s grandmother, Adelaide, still an indomitable figure, then served as regent until he assumed power in 994. Despite his youth, Otto was both able and vigorous. He continued the Italian policy of his father and grandfather…