In 1871 on the sleepy island of Birka, Sweden, Hjalmar Stolpe, a Swedish entomologist turned archaeologist, discovered the lavish grave of a Viking warrior. Around the seated body were the remains of two sacrificed horses, as well as a double-edged sword, a scramasax (a long, thin knife), a bow, a shield, and a spear—every weapon known to the Viking world. It was an astonishing find, especially since Viking warrior graves rarely contain more than three weapons. There was also a full set of hnefatafl, the board game often known as…
