«Notre sainte princesse» is an expression that appears in writings by the nuns of some convents in Flanders shortly after the death of Isabel Clara Eugenia. These writings included the representation and the image these nuns had been building of their sovereign and governor well before, during the course of her life. These words −«notre sainte princesse» (our holy princess)− contain three fundamental dimensions in the configuration of the image and the historical understanding of Isabel Clara Eugenia that will be the focus of this essay. Two powerful notions are alluded to in this statement −queenship and sanctity− and an interesting sense of belonging or appropriation («ours») is added. We are interested in the study of that framework as such, and we also intend to analyze how these three realities were historically interrelated and also show how the princess herself was actively involved and worked on the configuration and elaboration of that image of herself as a ruler «worthy of veneration», especially after her widowhood and in an exaltation of sanctity context. It is possible to see how hagiography and life were historically part of the same reality. We combine the study of sources from the female convents about the one who was sovereign of Flanders, Isabel Clara Eugenia, with the analysis of other initiatives of the princess herself and other operations that she performed. Our work aims to contribute to the incorporation of the notion of queenship to the interpretative frameworks that guide the studies on queens in the Modern Age. ; La expresión «notre sainte princesse» se registra en textos que habían escrito las religiosas de algunos conventos de Flandes poco después de la muerte de Isabel Clara Eugenia. Estos manuscritos recogían la representación y la imagen que estas religiosas habían ido construyendo de quien fuera su soberana y gobernadora antes, en el transcurso de su vida. Ese enunciado −«notre sainte princesse»− contiene tres dimensiones fundamentales en la configuración de la imagen y la ...