On the night of October 27th, 312 AD, before the historic battle of the Milvian Bridge, Jesus Christ appeared to the pagan emperor Constantine in a dream in which He instructed Constantine to paint a Christian cross on the battle standards of his army. Included with the banner were the words: In Hoc Signo Vinces, in this sign thou shalt conquer, and armed with this holy power, Constantine crushed his enemy and the Christian world was never the same.
With Constantine's victory and conversion to Christianity, he became the sole ruler of the Roman Empire and began to advance the Christian cause. New Churches were built in Rome and around the empire. When the Roman capital was moved to the city of Byzantium, Constantine built new churches there as well. Soon the city became a spiritual center for Christian of the Eastern Empire.
Beeswax candles were introduced into the liturgy in Byzantium and these pure candles continue as "lights shining in the darkness" these many centuries later.