Since classical antiquity, the wreath has been used as a symbol of power and strength. In Rome and Greece, kings and emperors often wore laurel wreathes as crowns - a practice they themselves borrowed from the Etruscans, who predated them. The Greeks and the Romans connected the laurel wreath to their sun god, Apollo, and considered the crown to embody his values.
Harvest wreathes - the predecessors to our modern decorations - were used in rituals for good harvests, and predate even written history. Ancient European animists often used evergreen in their wreathes to symbolize strength and fortitude, as an evergreen will live through even the harshest of winters. As for the connection to Christianity, since wreathes symbolized tenacity and everlasting life, they were often used in funerals of important people, specifically in the burials of saints and martyrs.
St. Nicholas Krampus Origin of Santa Claus Mistletow - Origination Boxing Day - Origination Santa Claus and Coca-Cola Gift Giving - Origin Stockings at Christmas - Origin Christmas Tree - Origin Caroling - Origin