History of chess rules

What happened in a pawn promotion during the middle ages?

How were bishops able to move initially?

Before the the 1400s, what was the weakest chess piece?

What was the rule regarding stalemate before 1600s?

Before the 1300s, how many ways could you win a game of chess?

Which year was the 3-fold-repetition rule introduced?

How many moves were considered all winnable endgames to be before 1989?

Which year was the 50-move rule finally introduced?

Which century was time finally used to govern chess games?

Which year introduced the rule of whites playing the first move always?