The Kebra Nagast, by E.A.W. Budge, [1922], at sacred-texts.com
19. HOW THIS BOOK CAME TO BE FOUND
And Dĕmâtĕyôs (Domitius), the Archbishop of Rôm (i.e., Constantinople, Byzantium), said, "I have found in the Church of [Saint] Sophia among the books and the royal treasures a manuscript [which stated] that the whole kingdom of the world [belonged] to the Emperor of Rôm and the Emperor of Ethiopia."