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 or heavily influenced by John Morton, Archbishop of Canterbury, in order to incriminate Richard III. Robert Fabyan's "Chronicles of London", compiled around 30 years after the princes' disappearance, names Richard as murderer. Thomas More (a Tudor loyalist who had grown up in the household of John Morton, an avowed foe of Richard III), wrote The "History of King Richard III", c.1513. This identified Sir James Tyrrell as the murderer, acting on Richard's orders. Tyrrell was the loyal servant of Richard III who is said to have confessed to the murder of the princes before his execution for treason in 1502.