John de la Pole, Earl of Lincoln. (Nephew of Edward IV and Richard III. Designated successor of Richard III. Regarded as the yorkist leader after Bosworth)
Edward Earl of Warwick. (Nephew of Edward IV and Richard III. Imprisoned in the ToL, 1485, age 10. Beheaded for alleged conspiracy with Perkin Warbeck in 1499)
Threats:
Yorkist Supporters (Lovell and the Staffords)
Margaret of Burgundy. (Sister of Edward IV and Richard III. Able and willing to fund yorkist ambitions)