Unlike his sources, Shakespeare gives Banquo no role in the King's murder, making it a deed committed solely by Macbeth and his wife, Lady Macbeth. Why Shakespeare's Banquo is so different from the character described by Holinshed and Boece is not known, though critics have proposed several possible explanations. First among them is the risk associated with portraying the king's ancestor as a murderer and conspirator in the plot to overthrow a rightful king, as well as the author's desire to flatter a powerful patron. But Shakespeare may also simply have altered Banquo's character because there was no dramatic need for another accomplice to the murder. There was, however, a need to provide a dramatic contrast to Macbeth; a role that many scholars argue is filled by Banquo. Similarly, when Jean de Schelandre wrote about Banquo in his "Stuartide" in 1611, he also changed the character by portraying him as a noble and honourable man—the critic D.W. Maskell describes him as "...Schelandre's paragon of valour and virtue"—probably for reasons similar to Shakespeare's.