The Philosopher and the Druids: A Journey Among the Ancient Celts

Persian Fire: The First World Empire, Battle for the West - 'Magisterial' Books of the Year, Independent

Julius Caesar

The Immortality Key: The Secret History of the Religion with No Name

Julian: Rome's Last Pagan Emperor

Ancient Rome: The Rise and Fall of an Empire

Hannibal: Rome's Greatest Enemy

An African History of Africa: Instant Sunday Times bestseller and shortlisted for the Nero Book Awards

Oh My Gods: A Modern Retelling of Greek and Roman Myths

The Complete Dead Sea Scrolls in English (7th Edition)

Celtic Spirituality: An Introduction to the Sacred Wisdom of the Celts

The Chemical Muse: Drug Use and the Roots of Western Civilization

The World of Saint Patrick

Zealot: The Life and Times of Jesus of Nazareth

Searching for Sappho: The Lost Songs and World of the First Woman Poet

Ireland and the Classical World

Supernatural: Meetings with the Ancient Teachers of Mankind

St. Patrick of Ireland: A Biography

The Warrior Ethos