The Secret History Omnibus v03 (2012)

Four immortal brothers and sisters leap through time, consumed in an epic struggle to influence and shape the history of Western civilization.
Since the dawn of time, Dyo, Reka, Aker, and Erlin, the four Archons who head the Four Houses, have fought each other to control the fate of hunmankind. But times change, and an evil Fifth Archon, William of Leece, is attempting to bring about the Apocalypse. From Moses' challenge to the Pharaoh to the origin of the Grail myth; from the Pope's extermination of the Cathars to Nostradamus' travels in Italy; from the Spanish Armada and the Great Fire of London to Napoleon's conquest of Egypt; and finally to the Angel of Mons appearing over the trenches of World War I: a secret occult history of the world.
Translated from the series' original French publication, this omnibus collects issues #15-20.