Many mysteries still surround Les Très Riches Heures. Questions remain unanswered as to who did what.  Aspects of the iconographic content (posing perhaps unsurmountable problems as to interpretation) and of the history of the manuscript await clarification. For attributions, with respect to the Limbourg illuminations, we have no clear picture regarding the specific individual contributions of the brothers – Herman, Paul and Jean; furthermore, there is the question of execution of various folios known not to be by the Limbourg brothers or Jean Colombe. We also have no proof of the brothers’ presumed journey to Italy (or at least the journey of the most talented of the three,  Paul de Limbourg). Such a journey would explain the brothers’ familiarity with the more advanced artistic canons current in the Italian peninsula at the time and with the examples of Antiquity. In the margins, the work also features highly cryptic heraldic and zoomorphic symbolic references (the bear, the snail etc.). Lastly, the changes in ownership between the time of the death of the duc de Berry and rediscovery of the manuscript in Genoa in the mid-nineteenth century have not been fully accounted for.