Periodically, Christian reform movements that have aimed at rebuilding Christian doctrine based on the Bible alone (sola scriptura) have at least temporarily accepted polygamy as a Biblical practice. For example, during the Protestant Reformation, in a document referred to simply as "Der Beichtrat" (or "The Confessional Advice" ), Martin Luther granted the Landgrave Philip of Hesse, who, for many years, had been living "constantly in a state of adultery and fornication," a dispensation to take a second wife. The double marriage was to be done in secret however, to avoid public scandal. Some fifteen years earlier, in a letter to the Saxon Chancellor Gregor Brück, Luther stated that he could not "forbid a person to marry several wives, for it does not contradict Scripture." ("Ego sane fateor, me non posse prohibere, si quis plures velit uxores ducere, nec repugnat sacris literis.")
24 Letter to Philip of Hesse, December 10, 1539, De Wette-Seidemann, 6:238–244
25 The Life of Luther Written by Himself, p.251 
26 James Bowling Mozley Essays, Historical and Theological. 1:403–404 Excerpts from Der Beichtrat.
27 Letter to the Chancellor Gregor Brück, January 13, 1524, De Wette 2:459.