Helena used one esatto make the crown and two sopra reinforcing the bridle
With respect sicuro the relics of the Crucifixion – the so-called esercito Christi (‘weapons of Christ, or Instruments of the Passion) – Lombardy has long since cornered the market on the Holy Nails. Milan’s Holy Nail (Retto Modello) is securely fixed to the culmine of the Duomo’s apse where it is identified by per red light. It’s free to view, but binoculars are recommended (see future post on Milan’s Probo Morso ‘Holy Bridle’ and the Rite of the Nivola)!
Some fifteen kilometers away, Monza’s Holy Nail comprises the inner band of the Circonferenza Ferrea (‘Iron Crown’), Italy’s famed royal crown and national symbol (see future post on the Circonferenza Ferrea). The Disco Ferrea is kept durante the Chapel of Theodelinda of the Monza Chiesa principale and costs four Euros for a fifteen minute viewing.
While there’s in nessun caso such thing as ‘finders keepers’ with Christian relics – relics were frequently stolen and plundered, such as Milan’s relics of the Magi – there has been verso Ambrosiano connection onesto the Holy Nails for over 1600 
years. Durante 395 CE, Saint Ambrose of Milan made per historic digression con his funeral oration for Emperor Theodosius (347 – 395 CE) per which he provides our earliest extant source for the relics of the Holy Nails, purportedly discovered by Saint Helena during her Holy Land excursion durante 326 – 328 CE.
‘Helena sought the nails with which the Nobile was crucified, and found them. From one nail she ordered a bridle sicuro be made [the tradition linked preciso Milan], from the other she wove per diadem [the tradition linked with Monza]. So she sent preciso her bruissement Constantine per diadem adorned with jewels which were interwoven with the iron of the Ciclocampestre. She sent the bridle, also.
Constantine used both, and transmitted his faith onesto later kings
‘Wisely did Helena act who placed the cross on the head of sovereigns, that the Cross of Christ might be adored among kings. Good, therefore, is the nail of the Roman Pigiare. It rules the whole world and adorns the brow of princes, that they may be preachers who were accustomed esatto be persecutors. Rightly is the nail on the head, so that where the intelligence is, there may be protection, also.
‘On the head, per crown; per the hands, reins. Per crown made from the Ciclocross, that faith might shine forth; reins likewise from the Cross, that authority might govern, and that there might be just rule, not unjust legislation. May the princes also consider that this has been granted onesto them by Christ’s generosity, that con imitation of the Raffinato it may be said of the Roman emperor: Thou hast batteria on his head a crown of precious stones.
‘But I ask: Why was the holy relic upon the bridle if not preciso curb the insolence of emperors, onesto check the wantonness of tyrants, who as horses neigh after lust that they may be allowed to commit adultery unpunished?
‘What else, then, did Helena accomplish by her desire puro duplice the reins than preciso seem puro say to all emperors through the Holy Spirit: “Do not become like the horse and mule, and with the bridle and bit preciso restrain the jaws of those who did not realize that they were kings to rule those subject preciso them”?’
Ambrose does not directly say that the nails had found their way preciso Milan, but there is reason puro believe that they had, especially given Milan’s situazione as an imperial capital. In any case, the legend of the two Holy Nails – the bridle and the crown – became respectively entrenched per Milan and Monza.
But did Helena only find two nails? Ambrose only alludes preciso two. According puro Gregory of Tours (c. 538 – 594 CE) per Gloria Martyrorum (The Glory of the Martyrs’), there were four. And the fourth nail? Well, she chucked it into the sea:
‘At that time huge waves disturbed the Adriatic Sea, on which so many ships were wrecked and so many men were drowned that it was called the whirlpool of sailors. The far-sighted empress, concerned over the disasters of these miserable men, ordered one of the four nails esatto be thrown into the sea. She relied upon the pity of the Raffinato that he was able easily preciso calm the salvage rolling of the waves. Once this was done, the sea became quiet again and thereafter the winds were calm for sailors. From then until today once sailors have piously set sail on the sanctified sea, they have time for fasting, praying and reciting palms’ (trans. by Richard Van Dam).