The story was getting into ground that he knew about.
'The thing to remember is that all these little empires thought themselves the successors of Prester John.

It took me a long time to find this out, and I have spent days in the best libraries in Europe over it.

They all looked back to a great king in the north, whom they called by about twenty different names.

They had forgotten about his Christianity, but they remembered that he was a conqueror.
'Well, to make a long story short, Monomotapa disappeared in time, and fresh tribes came down from the north, and pushed right down to Natal and the Cape.

That is how the Zulus first appeared.