1. The first LEO III was completed in 1961.

2. List of vacuum tube computers "Leo III Installations".

3. In 800, Pope Leo III crowned the Frankish ruler Charlemagne [Charles the Great] emperor of the Romans. . . .

4. In 798 Pope Leo III held a council in Rome that condemned the “Adoptionism” of Felix and Anathematized him

5. 16 An iconoclastic movement resulted from a decree from the eastern emperor, Leo III (717–7, forbidding any representation of human or animal form in the church.