Since the middle of the 12th century, marriage between Christians and Gentiles was customarily forbidden in the Catholic Church due to Impedimentum disparitas cultus (the difference in religion). Nevertheless, marriage was possible if the partner had previously converted. If this requirement was not fulfilled, the marriage was declared invalid even after the marriage had already taken place. In medieval society, the issue of marriage law was a very controversial subject. The problem is illustrated using the works of Wolfram von...