In the 7th century, the English monk St. Boniface went to teach the pagan Germans of Thuringia about Christianity. He used the fir tree’s triangular shape to explain the concept of the Trinity. The people came to revere the fir tree and by the 12th century would hang a tree upside down from their ceilings as a symbol of their faith. Reports of Christmas tree decorating traditions increased in the ensuing centuries. The first known decorated fir tree in England was set up in the year 1840 in Windsor Castle , occasioned by the wedding of the young Queen Victoria to her husband, the German Prince Albert.