Wodan's role during the Yuletide period has been theorized as having influenced concepts of St. Nicholas in a variety of facets, including his long white beard and his gray horse for nightly rides (compare Odin's horse Sleipnir) or his reindeer in North American tradition. Folklorist Margaret Baker maintains that "the appearance of Santa Claus or Father Christmas, whose day is the 25th of December, owes much to Odin, the old blue-hooded, cloaked, white-bearded Giftbringer of the north, who rode the midwinter sky on his eight-footed steed Sleipnir, visiting his people with gifts. Odin, transformed into Father Christmas, then Santa Claus, prospered with St Nicholas and the Christchild, became a leading player on the Christmas stage."