A civil war that led to the beheading of a king, an 11-year discontinuation of the monarchy, followed by a bloody man-hunt for the judges who signed his death warrant – are all part of one of the most tumultuous times in England’s history and the subject of “Killers of the King,” the latest book by Charles Spencer, 9th Earl Spencer. Spencer, the brother of the late Diana, Princess of Wales, is both part of England’s recent history and a renowned chronicler of its more distant eras. On Jan. 22, he will visit Drexel University to talk about his book and also about what it’s like to run the Spencer family estate of Althorp —a real-life Downton Abbey— in the 21st Century. This event is part of a lecture series sponsored by the Kal & Lucille Rudman Institute for Entertainment Industry Studies.