of Rome, the symbol we are discussing became a Roman--and therefore,
later on, upon the establishment of our faith as the State Religion of
the Roman Empire, also a _Christian_--symbol. And a loop seems to have
been sooner or later added to the top of the vertical spoke of the
Gaulish symbol, so that Christians could accept it as a Monogram of
Christ; as has already been hinted, and as will be demonstrated further
on.

A noteworthy point is that we have two accounts of Constantine's
alleged vision of the Christ, and that they do not quite agree. The
Bishop of Caesarea's account is, that the night after the Emperor--then
only ruler of Gaul--and all his soldiers saw the "cross" and motto
above the meridian sun, the Christ appeared to Constantine

"With the same sign which he had seen in the heavens,
and commanded him to make a likeness of that sign which
he had seen in the heavens, and to use it as a safeguard
in all engagements with his enemies."[35]

But the author of _De Mortibus Persecutorem_, a work said to have been
written during the reign of Constantine, and attributed to Lactantius,
refers to the alleged vision as follows:--

"Constantine was admonished in his sleep to mark the
celestial sign of God on the shields, and thus engage in
battle. He did as he was commanded, and marked the name
of the Christ on the shields by the letter X drawn
across them with the top circumflexed. Armed with this
sign his troops--"[36]