Sir William Stanley had originally been a Yorkist, and was favoured
by Edward IV and Richard III. However, by 1485, he had decided to
support Henry Tudor's bid for the throne, and was instrumental in
the defeat of Richard III at Bosworth, for which the new king Henry
VII rewarded him with the post of Lord Chamberlain. However, he was
then arrested and, on 6 Feb. 1495, tried for complicity in Perkin
Warbeck's conspiracy, admitting to the crime of treason.
Citation:
Editors. "Lord Chamberlain Stanley tried for complicity with Perkin Warbeck".
The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=13937, accessed 25 May 2013.]