in 1598, a succession dispute between the daughters of ferdinando stanley, 5th earl of derby and stanley's brother, william stanley was heard. it was decided by the privy council that the right to the isle of man belonged solely to queen elizabeth i, and the letters-patent of 1405 which have conferred the isle of man to the stanley family were declared null and void. this was because percy had not been subject to legal attainder, despite his treason, and the 1405 and 1406 letters-patent had therefore not taken effect.