Thomas Fauconberg or Thomas Neville, sometimes called Thomas the Bastard, or the Bastard of Fauconberg, was the natural son of William Neville, Lord Fauconberg, who was a leading commander in the Hundred Years' War and, until joining his cousin, Richard Neville in rebellion on the Lancastrian side against another cousin, Edward IV, served on the Yorkist side in the Wars of the Roses. Wikipedia