Since it first aired in 2011, Game of Thrones galloped up the ratings to become the most watched show in HBO’s history. It is no secret that creator George R.R. Martin was inspired by late 15th century Europe when writing A Song of Ice and Fire, the sprawling saga on which the show is based. Aside from the fantastical elements, Game of Thrones really does mirror historic events and bloody battles of medieval times—but how closely? Game of Thrones versus History: Written in Blood is a collection...