Excubitors Active c. 460 – c. 1081 Country Byzantine Empire Type heavy cavalry, imperial guard Garrison/HQ Constantinople, Bithynia, Thrace Engagements Battle of Pliska, Battle of Azaz (1030), Battle of Dyrrhachium (1081) Commanders Notable commanders Justin I, Marcellus, Tiberius II, Maurice, Philippicus, Priscus, Nicetas, Valentinus, Michael II, Constantine Opos