Definition of "Edmund"

This Edmund, in the reign of Bolingbroke, / As I have read, laid claim unto the crown; / And but for Owen Glendower, had been king, / Who kept him in captivity till he died.

1591 (date written), William Shakespeare, “The Second Part of Henry the Sixt, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies. […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)

To me, the sound of Mr. Bertram is so cold and nothing-meaning—so entirely without warmth or character!—It just stands for a gentleman, and that's all. But there is nobleness in the name of Edmund. It is a name of heroism and renown—of kings, princes, and knights; and seems to breathe the spirit of chivalry and warm affections.

1814 July, [Jane Austen], chapter IV, in Mansfield Park: […], volume II, London: […] T[homas] Egerton, […], pages 79–80