Mother Yolanda (or Yolande, Iolanda) of Vianden, O.P., (1231–1283) was the youngest daughter of Count Henry I of Vianden and Margaret, Marchioness of Namur. She joined the Dominican monastery in Marienthal, Luxembourg, against the wishes of her parents when she was very young. She later became its devout prioress and is now a legend in the history of that nation.
Yolanda's lasting fame is due in large part to the epic poem Yolanda von Vianden (see more below), written by Friar Hermann of Veldenz, O.P., which is one of only two works we have from him, the other being a prose account of her life. This poem recounts how, as a young girl, she wanted to become a nun against the wishes of her parents. Indeed, her mother had hoped to arrange a marriage to the noble Walram of Monschau, in order to consolidate the influence of the Counts of Vianden, especially in their relations with the Counts of Luxembourg. In 1245, when Yolanda was 14, her mother, the Marchioness Margaret of Courteney (French: Marguerite de Courtenay), brought Yolanda along as her companion on a visit to the Dominican monastery of Marienthal, where Yolanda unexpectedly fled into the protection of its cloister and gained admission as a novice.