Germany is credited with starting the Christmas tree tradition
in the 16th century when devout Christians brought decorated trees into their homes.
Some built Christmas pyramids of wood
and decorated them with evergreens and candles
if wood was scarce.
It is a widely held belief that Martin Luther,
the 16th-century Protestant reformer,
first added lighted candles to a tree.
Walking toward his home one winter evening,
composing a sermon,
he was awed by the brilliance of stars twinkling amidst evergreens.
To recapture the scene for his family,
he erected a tree in the main room and wired its branches with lighted candles.
Copied from A History of Christmas blog.