Edmund de la Pole, 3rd Duke of Suffolk

Edmund de la Pole, 3rd Duke of Suffolk was the fourth son of John de la Pole and Elizabeth Plantagenet. He was the grandson of Richard Duke of York and William de la Pole the 1st Duke. Folowing the death of eldest brother John at Stoke Field in 1487, Edmund became the Yorkist claimant to the throne. Although he succeeded to the title Duke of Suffolk in 1491, in 1493 he was demoted to the rank of Earl.

In 1501 Edmund, aided by Sir James Tyrrell, fled from England and sought refuge with Maximilian I, the Holy Roman Emperor. Tyrell was later executed for providing help to the latest Yorkist pretender. In a treaty with Henry VII signed in 1502 Maximillian agreed not to support de la Pole should he make an attempt on the English throne. In 1506, Maximilian's son, Philip of Burgundy, became the reluctant guest of Henry VII. Eager to set sail again in order to claim his wife's Castillian inheritance, he was cajoled by the Tudor king to hand over de la Pole. Henry agreed to the proviso that Suffolk would not be harmed and instead imprisoned the Earl. His unscrupulous successor, Henry VIII, did not feel himself bound by this agreement and angered by the plots of his exiled younger brother Richard de la Pole, ordered Edmund's execution in 1513.

https://en.wikipedia.org/wiki/Edmund_de_la_Pole,_3rd_Duke_of_Suffolk

Edmund de la Pole, 3rd Duke of Suffolk, 6th Earl of Suffolk, KG (1471/1472 – 30 April 1513), Duke of Suffolk, was a son of John de la Pole, 2nd Duke of Suffolk and his wife Elizabeth of York.

https://en.wikipedia.org/wiki/Edmund_de_la_Pole,_3rd_Duke_of_Suffolk