When and how did the cross become the prevailing symbol of Christianity that it did?

by tarekd19

I understand that the cross has significance in Christianity due to the passion of Jesus, but has it always had the same widespread use as a symbol since the resurrection? Were other symbols used before it was adopted?

Ta11ow

Related question:

Was the cross originally a symbol of death, or did it have other uses or meanings in religious circles before crucifixion became widespread in use?

Copelongcut1868

Also related (sorry guys lol):

Wouldn't the Chi Rho (Constintine's battle symbol) have been a more natural choice?

After all without milvian bridge Christianity never gets a foothold in the Roman Empire