slavery came first. then the notion of blackness as low order came after. this was a projection. not an initial misunderstanding.
for the first few hundred years of slavery in the americas, the majority of residents were Africans, some European 'underclass' as overseers, explorers (NO white WOMEN by the way - at all, hence the starts of mixed children born as slaves), sadists, pirates, murderers, etc, etc... the very rich planters hardly left their Liverpool mansions while their corporations arranged for the clearing of land for farming, planting and building, before mass migration and settlement of European upper class populations (who could afford and dared to), and then middle class key worker types (government admin, banking, teachers, etc) and finally the fillers - the poor of Europe 18th and 19th century.
you can get more of this type of early slave trade history on anything that has to do with Jamestown, Virginia.
so... addressing Empress Sheba's small confusion... the European people did not have to accept anything about Africans on their shores. Especially not any women. When Africans were being shipped in droves to the Americas, all they were seeing is bare trees, and beaches. When European families starting moving to settle in the Americas, it is there they went to find the Africans. As thee i say, by the time they met these Africans they already had the 'Americas' induction as thee I say about black being devilish and other things.
Prior to this within Europe, only the wealthy and upper classes really ever saw Africans who were either visiting the capital cities usually, or if they were living in Europe they were... working, trading, practising (LOTS OF physicians, writers, teachers, musicians - one of the top paid trumpeteers in the court of Henry VIII was African), some students... all kinds of NORMAL reasons why Africans might live in Europe. Or why anybody would live anywhere. At one point during the reign of Elizabeth I, Africans were so running the show that she ordered to have every single one removed. A bit like Idi Amin and the Asians. Not in an inferiority way... or thinking, well Jesus is white, so I can do anything.
By the time Elizabeth gave her top high seas / high ocean vessel Jesus of Lubeck to Cpt John Hawkins in the 16th century so that he could sail to West Africa (his first point of contact is what is now Sierra Leone - by the way, this was also the first British African colony after the "abolition" of the "trade") it was already clear in words, works, deeds, history, FACT... that SHE knew full well that Africans are certainly at the very LEAST just normal human beings. She inherited her ocean fleet from her father Henry VIII. He himself knew. He had received all sorts of African dignitaries, never mind the ones he had seen in Spain, France, every flippin where.
It would take me all day to write a post long enough, but I do have the information... so I could go on and on making the point that when mass enslavement began, it was instigated and motivated based purely on jealousy. Misunderstandings over inferiority could not be further from the truth. Africans were targeted by the Europeans because Europeans knew LONG time of the might, strength, industriousness, vigour, intelligence, and creativity of Africans since even before Cleopatra was in nappies. They were necessary for the success of the Masonic plan for the 'New World'.
Regarding white people misunderstanding the inferiority thing... sorry to say, it is just as simple as telling someone what they want to hear to make them believe anything. Put it this way it took a good couple of hundreds of years for any Europeans to start saying../ hang on a minute, our good lord jesus christ taught us that... For a long time they were enjoying have ice tea brought to them by pretty brown maids.