Dr Charlotte Woodford, fellow in German at Cambridge University, tells the story of the woman who won Martin Luther's heart.

If ever there were a power behind the throne, none was stronger than Katharina von Bora. Known as 'The Lutherine', this former nun found her true vocation as Luther's 'Power-Frau,' arguing the finer points of Theology with him as well as raising their six children and providing hospitality for Luther's fellow-reformers in Wittenberg.

Luther had told friends he didn't intend to take a wife, and when he eventually decided to marry Katharina he wrote to a friend that he did not feel 'passionate love' for her. But later he described her in the most glowing terms possible for a biblically-minded theologian, comparing his devotion to her with that which he felt for one of St Paul's epistles. 'The epistle to the Galatians is my dear epistle. I have put my confidence in it. It is my Katy von Bora'.

Producer: Rosie Dawson

Part of Radio 3's Breaking Free series of programmes exploring Martin Luther's Revolution.