Do you know how the True Cross was distinguished from the other
2.
Socrates Scholasticus (born c. 380), in his Ecclesiastical
History, gives a full description of the discovery [1] that was
repeated later by Sozomen and by Theodoret. In it he describes how
Saint Helena, Constantine's aged mother, had the temple destroyed
and the Sepulchre uncovered, whereupon three crosses and the
titulus from Jesus's crucifixion were uncovered as well. In
Socrates's version of the story, Macarius had the three
crosses placed in turn on a deathly ill woman. This woman recovered
at the touch of the third cross, which was taken as a sign that
this was the cross of Christ, the new Christian symbol.
Socrates also reports that, having also found the nails with which
Christ had been fastened to the cross, Helena sent these to
Constantinople, where they were incorporated into the emperor's
helmet and the bridle of his horse