Generate a question with a factual answer.
Generated: Who had taken control of Luoyang?

Generate a question with a factual answer.
Generated: What caused the nobility to leave Valencia?

Generate a question with a factual answer.
Generated: When did the idea of a hidden church begin?

Generate a question with a factual answer.
Generated: Who believed that action needed to be taken to level out the social and economic playing field before natural selection could occur to improve humanity?