… kept winter holiday traditions by decorating their houses in honor of the emperor:
“Let them over whom the fires of hell are imminent, affix to their posts, laurels doomed presently to burn: to them the testimonies of darkness and the omens of their penalties are suitable. You are a light of the world, and a tree ever green. If you have renounced temples, make not your own gate a temple.”
But, at the beginning of the Middle Ages, things were starting to change. People started spreading the legend that when Christ was born, every tree on Earth shook off its snow and produced new shoots of green. At about the same time, Christian missionaries also started preaching about how Christians could engage traditions using the ‘evergreen’ trees and celebrate the winter season too.
Even so, it’s still not clear when people actually started decorating Christmas tree specifically to celebrate the birth of the Lord. Some clues may be dating way back to 1510’s Latvia and a few legends claim that it was Martin Luther, a protestant reformer, who invented the Christmas tree.