Katharina and Martin Luther I have vague memories of watching a movie about Martin Luther forty years ago for a class at school. The lingering impressions consist of the doors to a church and the constant danger of bucking the Roman Catholic Church at its most powerful. And of course, the hymn. I knew Martin Luther wrote my favorite hymn—”A Mighty Fortress.” From time spent in Europe, I knew that Martin Luther played a huge role in the Reformation and…