Edited sentence: European usually attempt to focus of their differences than on their unity.However, during the reign of King of kings of Ezana, there were three other kings under king of kings Ezana; and they were the king in Yemen, the King in Keffa(Southern part of Ethiopia), and the king of Noba(Nubia).Noba was a northern bound of an  Ethiopian Kingdom.Regional lords are simply lords, not kings.The king of Noba was under the Ethiopian King of Kings.The title "King of Kings" was used since antiquity even before the Axumite empire.Zewditu was not the only queen in Ethiopia