The historical basis for Helena's fourth century discovery of the True Cross rests on later Christian sources rather than on any contemporary eyewitness account from the time of the reported find itself, and modern historians generally treat the specific narrative of her excavation as a pious tradition that developed after the fact rather than as a documented historical event that can be verified independently, a distinction the church's own liturgical veneration of the cross does not depend on resolving either way.
Fragments of wood venerated across medieval and modern Europe as relics of the True Cross multiplied to a degree that drew sceptical comment even within the church itself, most famously the Reformer John Calvin's often-repeated remark, whose precise original wording is disputed by scholars, that the accumulated relic fragments claimed across Christendom would be enough to build a full ship rather than a single cross, an observation that reflects a long-standing and not merely modern awareness that the sheer quantity of claimed relics could not plausibly all derive from one physical object, whatever the devotional and historical value that individual fragments and the feast itself carry regardless of that difficulty.