As the anniversary of Jesus’s birth approaches, Slate.com explores the history (and mystery) of one of the many gifts/priceless collector’s items he left his followers—antique foreskin.

In 1983, as the residents of Calcata, a small town 30 miles north of Rome, prepared for their annual procession honoring a holy relic, a shocking announcement from the parish priest put a damper on festivities. “This year, the holy relic will not be exposed to the devotion of the faithful. It has vanished. Sacrilegious thieves have taken it from my home.” Not since the Middle Ages, when lopped-off body parts of divine do-gooders were bought, sold, and traded, has relic theft been big news. But the mysterious disappearance of Calcata’s beloved curio is different.

This wasn’t just the residuum of any holy human—nor was it just any body part. It was the foreskin of Jesus Christ, the snipped-off tip of the savior’s penis, the only piece of his body he supposedly left on earth.

Just what the holy foreskin was doing in the priest’s house—in a shoebox at the back of his wardrobe, no less—and why and how it disappeared has been debated ever since the relic vanished. Some suspect the village priest sold it for a heavenly sum; others say it was stolen by thieves and ended up on the relics black market; some even suggest Satanists or neo-Nazis are responsible. But the most likely culprit is an unlikely one: the Vatican.

Ho ho ho! Praise him!