The radicalized war-time nationalisms of the First World War had put pressure on Europe’s internationally connected ruling dynasties and led to a symbolic nationalisation of the Romanian monarchy. However, this article argues that the Romanian dynasty preserved much of its transnationality and the foreign origins of King Ferdinand and Queen Marie continued to play a significant role in domestic and foreign affairs after the end of war. To show this, the article analyses the development of royal family relations and self-conceptions after the armistice and examines how the transnational aspects of the monarchy influenced Romania’s sortie de guerre period abroad and at home, contributing to a better understanding of monarchic transnationality after the First World War.