When in AD did crosses begin to be worn?

Answer 1

The wearing of crosses as a Christian symbol began to emerge in the early centuries of the Christian church, particularly after the Edict of Milan in AD 313, which granted religious tolerance to Christians in the Roman Empire. By the 4th century, crosses became more widely recognized as a symbol of faith, especially following the conversion of Emperor Constantine. However, it was not until the Middle Ages that the cross became a common item of personal adornment among believers.