SK1 = Lambert Simnel claimed to be the earl of warwick a leading yorkist claimant - was supported by Margaret of Burgundy who sent 2000 mercenaries and Ireland as he was crowned in a Dublin Cathedral
SK2 = Perkin Warbeck repeatedly gained support from foreign powers e.g. Charles VIII at French court, Margaret of Burgundy, Maximillian and later James V who even let him marry his cousin - prolonged his threat and jeopardised foreign relations
CSK = Henry was able to quickly disprove Simnel’s claim as the real of Earl of Warwick was alive so he paraded him in the streets