 Edmund took part in the Siege of Boulogne in October 1492.However, he is said to have subsequently agreed with King Henry VII, by Indenture dated 26 February 1492/3, to surrender the Dukedom (with, apparently, the Marquessate) of Suffolk, and to be known henceforth as the Earl of Suffolk only, this being ratified by Act of Parliament in 1495.In consideration of this surrender and "of the true and diligent service done to his Highness by the said Edmund" the King granted to him, for £5,000, a portion of the lands forfeited by his elder brother John, Earl of Lincoln, in 1487.