<Li> Henry Percy, 8th Earl of Northumberland, for involvement in several pro-Catholic and Marian plots, from November 1571 to after June 1573, a few weeks in late 1582, and from December 1584 to June 21, 1585, when he was found shot to death in his cell; brought in as a suicide . </Li> <Li> Saint Henry Walpole was imprisoned in 1593 . While incarcerated in the Salt Tower, he carved his name in the plaster along with those of saints Peter, Paul, Jerome, Ambrose, Augustine, and Gregory the Great . He was put to death in York on 7 April 1595 . </Li> <Li> Saint Philip Howard was committed to the Tower of London on 25 April 1585 . He died alone on Sunday, 19 October 1595 . </Li> <Li> Robert Poley, spy and messenger for the court of Queen Elizabeth I, was imprisoned on the charge of treason . He used his time in the Tower to gather information on his fellow prisoners . He was released a year and a half later . </Li>

Who was locked up in the tower of london