Celtic mythology
The wren celebration may have descended from Celtic mythology. Ultimately, the origin may be a Samhain or midwinter sacrifice or celebration, as Celtic mythology considered the wren a symbol of the past year (the European wren is known for its habit of singing even in mid-winter, and its name in the Netherlands, "winter king," reflects this); Celtic names of the wren ("draouennig, drean, dreathan, dryw" etc.) also suggest an association with druidic rituals.