Nobody is really sure when Fir trees were first used as Christmas trees. It probably began about 1000 years ago in Northern Europe. Many early Christmas Trees seem to have been hung upside down from the ceiling using chains (hung from chandeliers/lighting hooks).
In early church calendars of saints, 24th December was Adam and Eve's day. The Paradise Tree represented the Garden of Eden. It was often paraded around the town before the play started, as a way of advertising the play. The plays told Bible stories to people who could not read.
The first person to bring a Christmas Tree into a house, in the way we know it today, may have been the 16th century German preacher Martin Luther. A story is told that, one night before Christmas, he was walking through the forest and looked up to see the stars shining through the tree branches. It was so beautiful, that he went home and told his children that it reminded him of Jesus, who left the stars of heaven to come to earth at Christmas.
There is another legend, from Germany, about how the Christmas Tree came into being, it goes:
Once on a cold Christmas Eve night, a forester and his family were in their cottage gathered round the fire to keep warm. Suddenly there was a knock on the door. When the forester opened the door, he found a poor little boy standing on the door step, lost and alone. The forester welcomed him into his house and the family fed and washed him and put him to bed in the youngest sons own bed (he had to share with his brother that night!). The next morning, Christmas Morning, the family were woken up by a choir of angels, and the poor little boy had turned into Jesus, the Christ Child. The Christ Child went into the front garden of the cottage and broke a branch off a Fir tree and gave it to the family as a present to say thank you for looking after him. So ever since them, people have remembered that night by bringing a Christmas Tree into their homes!
It seems most of the stories come from Germany. Tinsel is said to come from Germany. Now the lights, we have Thomas Edison to thank for putting lights on our trees!