This article examines the genealogical claims of Nikephoros III Botaneiates, namely his supposed descent from the Phokades and the ancient Roman Fabii, and aims to situate Botaneiates’ case within a broader context of exaggerated and contested claims of kinship in medieval Byzantium. While exploring the uses of fictionalized or exaggerated kinship and their reception in contemporary society, it addresses issues of authenticity, proof, and credibility. It argues that Byzantine authors were widely sceptical of audacious genealogical claims and may have been exposed to false claims of kinship more often than previously acknowledged.