Although there are dissenting opinions, the book is generally believed to be the work of the leading Parisian illuminator, Jean Pucelle (or Jehan Pucele). It is usually identified with the book mentioned by Queen Jeanne in her will, in which she leaves to Charles V "un bien petit livret d'oroisons que le roy Charles, dont Dieu l'ame, avoit faict faire pour Madame, que pucelle enlumina" ("a very small prayer book which King Charles, may God protect him, had made for Madame, which Pucelle illuminated"). The identification of the patrons, illuminator and the date assigned to the work all largely depend on identifying this book with the manuscript in New York, as does any clear conception of what Pucelle's personal style was. However this refers to a prayer book not a book of hours, and it has been doubted that this imprecision would have been likely in such a context. In addition none of Jeanne's heraldry appears in the book, unlike two other royal manuscripts made when she was queen, her Coronation Book and a breviary.