A Kaiserpfalz at Tilleda is attested by the 972 marriage certificate of Emperor Otto II and Empress Theophanu.
The Byzantine influence further increased with the marriage of Otto II with Princess Theophanu, who upon her husband's death in 983 ruled as Empress dowager for her minor son Otto III until 991.
Theophanu or Theophano, consort of Otto II, Holy Roman Emperor (reigned 967 - 983)
During this period the Byzantine princess Theophanu, wife of the Holy Roman Emperor Otto II, served as regent of the Holy Roman Empire, paving the way for the westward spread of Byzantine culture.