This article is about the science fiction series;The Age of Unreason (ISBN 0099548313) is also the title of a book by Charles Handy.

The Age of Unreason is a series of four novels written by Gregory Keyes:

• Newton's Cannon (1998), ISBN 156865829X
• A Calculus of Angels (1999), ISBN 0739402609
• Empire of Unreason (2000), ISBN 0345406095
• The Shadows of God (2001), ISBN 034543904X

The story spans the late seventeenth and early eighteenth century. The author makes use of pseudosciences (scientific alchemy instead of our physics) that were popular at the time: using affinity and aether, for example. Some historical characters appear: Isaac Newton, Louis XIV of France, Benjamin Franklin and Peter the Great of Russia have important roles in various volumes. Action moves between England and France, later involving Russia, Austria and the American Colonies.

Science fiction book series | Steampunk