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 Portuguese document suggests Buckingham as the guilty party, stating "...and after the passing away of king Edward in the year of 83, another one of his brothers, the Duke of Gloucester, had in his power the Prince of Wales and the Duke of York, the young sons of the said king his brother, and turned them to the Duke of Buckingham, under whose custody the said Princes were starved to death." A document dated some decades after the disappearance was found within the archives of the College of Arms in London in 1980; this stated that the murder "be the