In Christmas Before Christianity, Lochlainn Seabrook presents a thoroughly researched examination of the “ingredients” that have, over centuries and millennia, contributed to our contemporary understanding of what many, right or wrong, consider the holiest day of the year. Early on, Seabrook discusses the paucity of historical evidence surrounding the figure of Jesus in order to subsequently demonstrate the ways in which the relative blank slate of his biography allowed early Christians to incorporate a myriad of other belief systems into what eventually came to be accepted as canon. Chief among these other systems, as the book’s subtitle suggests, was a firm belief that the sun was the center of all life. Indeed, the author points out that, in his words, “Jesus’ birth on December 25 specifically was not mentioned by any writer, scholar, or historian” during the time in which Jesus lived; what’s more, the date traditionally associated with the birth of Christ was not established until the year 534, “not because Jesus was born on that date, but rather because the Christian masses overwhelmingly identified Jesus with the Pagan Roman sun-god Mithras, as well as with other pre-Christian solar deities, all whose birthdays fell on December 25.” In addition to investigating the ways in which pre-Christian mythology fed into the story of the birth of Christ, Seabrook also examines the origins of the season’s accoutrements including the Christmas tree (a pagan fertility symbol originating in Egypt), the tale of the three wise men (an allusion to ancient astrology and the three stars that comprise Orion’s belt), and Santa Claus (an amalgam of Odin, Thor, and various maritime deities). Other topics Seabrook explores include the evolution of Christmas cards, plum pudding, Christmas wreaths, mistletoe, holly, and pantomime from their ancient forms to the ways in which we employ and enjoy them today. Altogether, a fascinating and meticulously detailed read for anyone curious about the origins of Christmas — or, for that matter, about the ways in which myths and legends evolve over time.