It was 500 years ago today that Martin Luther was famously reported to have nailed his 95 Theses to the door of a Wittenberg church.
At the time, Luther only wanted to talk about his opposition to the sale of indulgences to absolve sin; he never thought his call for debate would lead to changing the religious and cultural history of the world.
But that was, of course, what happened – and Protestant Christianity was born.