Manhood was a complex social construct in early modern England. Males could not simply mature or grow from boys to men. Instead, they had to assert or prove they were men in multiple ways, such as growing a beard, behaving courageously in battle, exercising self-control in walking, talking, weeping, eating, and drinking, pursuing manly interests, exhibiting manly behaviors, avoiding interests or behaviors typically ascribed to women, marrying a woman and providing for her physical, sexual, and spiritual needs, and living and dying as a faithful Christian. Once a male became a “man” in the eyes of others, his efforts shifted from “making” himself manly to maintaining or defending his reputation as a “true man.” All men could undermine their manhood through their own actions or inactions, but the married man could also lose his reputation through his wife's infidelity. Numerous literary husbands in early modern literature live anxiously with the knowledge they might suffer a cuckold's humiliation and shame. Matthew Shore, who “treasures” his wife to a fault in Thomas Heywood's two-part play Edward IV, is an exceptional example of such a husband. This critical reading of Edward IV explores the complexity of manhood in Heywood's day by showing various males trying to assert or defend their manhood; explaining why husbands had reasons to fear cuckoldry; analyzing how Jane Shore's infidelity affects her husband; following Matthew Shore's journey from trusting husband to distrusting, bitter cuckold, to forgiving husband; and examining his seemingly inexplicable death at the end of the play.