Well, it's not The Holy Hand Grenade of Antioch, it's.....

The Holy Foreskin.......

Of all the holy relics that circulated throughout medieval Europe, relics associated with Jesus Christ, anything he supposedly touched or used during his life were the most prized. By this measure, no relic was more valuable than the Holy Foreskin since it was an actual body part of Christ. In fact, the foreskin is the only body part the Bible specifically mentions being removed from Christ during his life (eight days after his birth) and which presumably stayed behind on Earth after he ascended into Heaven.

The Holy Foreskin first made an appearance in medieval Europe around 800 ad, when King Charlemagne presented it as a gift to Pope Leo III. Charlemagne said it had been given to him by an angel. However, rival foreskins soon began to pop up all over Europe. All told, twenty-one different churches claimed to have the Holy Foreskin, often at the same time. Various miraculous powers were attributed to these foreskins. In particular, they were supposed to be able to protect women during childbirth.

Given the glut of Holy Foreskins, churches made efforts to have their foreskin authenticated by Church leaders as the sole genuine article. In the early 12th century, the monks of San Giovanni in Laterano, Rome asked Pope Innocent III to rule on the authenticity of their foreskin, but he declined to do so. Later, the monks of Charroux claimed their foreskin to be the only real one, pointing out that it apparently yielded drops of blood. This convinced Pope Clement VII (1523-1534) who declared theirs to be the authentic thing.

Some medieval theologians argued that all the Holy Foreskins necessarily had to be frauds since the actual Holy Foreskin had, they asserted, ascended into Heaven with Christ. The 17th century theologian Leo Allatius speculated in his essay De Praeputio Domini Nostri Jesu Christi Diatriba that the holy foreskin had ascended into heaven at the same time as Jesus, and had become the rings of Saturn.

The Catholic Church eventually sought to extract itself from the Holy Foreskin controversy, deciding that it was rather unseemly for so much attention to be paid to Christ's private parts. It adopted the view that all the rival foreskins were frauds, and in 1900 made it a crime punishable by excommunication to write or speak about the Holy Foreskin.