Comment: Pretty sure?

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Pretty sure?

Research, research!!

"THE LATIN- OR ROMAN CROSS
the latin cross or ‘crux immissa’ is the most popular form of crosses.
during the first three centuries of christianity, the cross was
rare in christian iconography (although it is found on coins,
medals, and ornaments anteriour to the christian era and
descriptions of it are found in christian writings from the
early 2nd century onwards. the cross first became prominent
in christian imagery during the late 3rd century).
the upper arm of the latin cross and the two side arms are of
equal length while the lower arm is twice as long as any of the
other three. it was on this cross that christ is said to have been
crucified, and thus it became accepted as the christian cross."
http://www.designboom.com/history/cross_2.html

The Jewish Encyclopedia says:[12]

The cross as a Christian symbol or "seal" came into use at least as early as the second century (see "Apost. Const." iii. 17; Epistle of Barnabas, xi.-xii.; Justin, "Apologia," i. 55-60; "Dial. cum Tryph." 85-97); and the marking of a cross upon the forehead and the chest was regarded as a talisman against the powers of demons (Tertullian, "De Corona," iii.; Cyprian, "Testimonies," xi. 21–22; Lactantius, "Divinæ Institutiones," iv. 27, and elsewhere). Accordingly the Christian Fathers had to defend themselves, as early as the second century, against the charge of being worshipers of the cross, as may be learned from Tertullian, "Apologia," xii., xvii., and Minucius Felix, "Octavius," xxix. Christians used to swear by the power of the cross
https://en.wikipedia.org/wiki/Christian_cross

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