So looking back at the year I was trying to remember how many books I got through, it looks like about 20.
Here is what I finished:
The Radical Face of the Ancient Constitution by Janelle Greenberg
The Making of England by C. Warren Hollister
Isabella and the Strange Death of Edward II by Paul Doherty
On the Medieval Origins of the Modern State by Joseph R. Strayer
Leviathan by Thomas Hobbes
Two Treatieses on Government by John Locke
Six Books of the Commonwealth by Jean Bodin
Utopia by Thomas Moore
The Commonwealth of Oceana by James Harrington
Discources on the first ten books of Titus Livy by Niccolo Machiavelli
Civil War Vol I, II, III by Shelby Foot, I'm counting this as three.
Churchill by Roy Jenkins
Thunder along the Mississipi by Jack Coombe
Blood and Thunder by Hampton Sides
A History of the Arab Peoples by Albert Hourani
A history of the Middle Ages by Brinton, Christopher and Wolf
The Jewish War by Josephus
Twelve Caesars by Suetonius
The Proud Tower by Barbara Tuchman
Three Empires on the Nile by Dominic Green
Vietnam by Stanley Karnow
I usually try to read one novel a year, which I didn't really get to this year, I guess you could count Utopia as a novel in many ways, though. I managed to get halfway through a bio of Henry II which I'm going to pick up again shortly.