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 murder theory, the most common explanation is that they were murdered by Richard. Many historians conclude that Richard III is the likeliest candidate for the disappearance of the princes for a number of reasons. Although the princes had been eliminated from the succession, Richard's hold on the monarchy was very insecure due to the way in which he had attained the crown, leading to a backlash against him by the Yorkist establishment. An attempt had already been made to rescue them and restore Edward to the throne, clear evidence that the existence of the princes would remain a threat as