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The Norse theory
The tradition may also have been influenced by Scandinavian settlers during the Viking invasions of the 8th to 10th centuries though it is usually attributed to the "Christianising" of old pagan festivals by saints to ease the transition and promote conversion.Various associated legends exist, such as a wren being responsible for betraying Irish soldiers who fought the Viking invaders by beating its wings on their shields, in the late 1st and early 2nd millennia, and for betraying the Christian martyr Saint Stephen, after whom the day is named. This mythological association with treachery is a possible reason the bird was hunted by wrenboys on St. Stephen's Day, or why a pagan sacrificial tradition was continued into Christian times. Despite the abandonment of killing the wren, devoted wrenboys continue to ensure that the Gaelic tradition of celebrating the wren continues, although it is no longer widespread.[9]