Hazbun explores the purported illegitimacy of Spain’s medieval hero El Cid, Rodrigo Diaz de Vivar, through the lens of the epic poems Cantar de Mio Cid (Song of My Cid) and Mocedades de Rodrigo (The Youthful Deeds of Rodrigo, the Cid). The chapter demonstrates that illegitimacy is central to the Cantar’s exploration of the relationship between social status and identity, birth and worth. The chapter assesses illegitimacy, speech, and truth, and considers how in the oral context of traditional epic, illegitimacy is fashioned through the voice in the form of hearsay, gossip, and public opinion. The discussion of Mocedades de Rodrigo focuses on how the hard contours of illegitimacy are questioned in a context where formal structures of power and political identities more generally are being continually tested and reshaped, in tandem with the epic genre itself.