Holy Lance
The Holy Lance, also known as the Lance of Longinus (named after Saint Longinus), the Spear of Destiny, or the Holy Spear, according to the Gospel of John, is the lance that pierced the side of Jesus as he hung on the cross.
Instrument of Jesus' crucifixion
Dionysius of Halicarnassus, who lived at the time of the birth of Jesus, described how those condemned to crucifixion were led to the place of execution:
Dionysius here uses the Greek word "xylon" (ξύλον) for the horizontal crossbeam (the "patibulum") used in Roman crucifixions; he describes how the hands of the condemned man were tied to it ("χεῖρας ἀποτείναντες ἀμφοτέρας [...] προσδήσαντες") for him to be whipped while being led to the place of execution.