Holland is an English novelist and popular historian who had published a trio of best-selling histories of the ancient world: Rubicon: The Last Years of the Roman Republic (2003), Persian Fire: The First World Empire and the Battle for the West (2005), and Millennium: The End of the World and the Forging of Christendom (2008). In 2012, Holland's fourth work of history, In the Shadow of the Sword: The Battle for Global Empire and the End of the Ancient World, was published; it explored the collapse of the Roman and Persian Empires, as well as the rise of the Arab Empire and the accompanying Arabian religion of Islam.[1][2]