William ap Ieuan, of Whitchurch

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5264/BLEDDYN... (July 23, 2017; Anne Brannen, curator)

Servant to Jasper Tudor, Duke of Bedford and to King Henry VII.

The story that he married Jasper Tudor's illegitimate daughter. was apparently invented to give the Cromwells a tie to a Tudor heritage. Please see the discussion at https://www.geni.com/discussions/170319

The fictional Joan Tudor can be found here: Joan Tudor

His son and heir was Morgan Williams, who married the sister of Thomas Cromwell, Earl of Essex.