Note 434 — APPENDIX.
Reading edition
Nevertheless, Otto II was crowned Emperor, and reigned for some time along with his father, under the title of 'Co-Imperator.' So Lothar I was associated in the Empire with Lewis the Pious, as Lewis himself had been crowned in the lifetime of Charles. Many analogies to the practice of the Romano-Germanic Empire in this respect might be adduced from the history of the old Roman, as well as of the Byzantine Empire.