Princes in the Tower "the murther of his nephews towards the world", indicating that the boys did indeed meet their end during Richard's days. It is also unlikely that the princes would have been kept alive in secret by Richard for 2 years after their last sighting while rumours of his responsibility for their murder circulated. Some writers have also accused John Howard, 1st Duke of Norfolk; Margaret Beaufort, Henry VII's mother; and Jane Shore (Edward IV's mistress). Pollard writes of these theories: "None deserve serious consideration. The problem with all these accusations is that they beg the question of access to the Tower
Princes in the Tower it would discourage rebellion. Holinshed's Chronicles, written in the second half of the 16th century, claims that the princes were murdered by Richard III. The chronicles were one of the main sources used by William Shakespeare for his play "Richard III", which also portrays Richard as the murderer, in the sense that he commissions Tyrrell to have the boys killed. A. J. Pollard believes that the chronicle's account reflected the contemporary "standard and accepted account", but that by the time it was written "propaganda had been transformed into historical fact". It should also be noted that Thomas More wrote his