On 4 September 2019, a Frankfurt court ruled that Germany must recognize marriages involving minors that had been concluded within the EU. The case involved a couple who had married in Bulgaria and now resides in Germany. The bride was 17 when she wed. The case throws into sharp relief hidden assumptions within the broader debate about ‘child marriage’ that has occupied German politicians and commentators over the last two years. These assumptions matter because they reflect broader European and international popular and political discussions as well as laws. But they also matter because they ignore a number of important developments over the last century across much of the world in reforming family law.