All the splendor, majesty, Byzantine  plotting, and senseless destruction of the first three Crusades, designed for  the Wildside Gaming System (but easily adapted to other systems). Contains all  the resources a GM needs to build a Crusades-based campaign, whether the players  are in the roles of princes or peasants, Crusaders or Caliphs. 
Nearly a century of history is covered,  allowing for long campaigns, and the book spills over into a variety of  environments in Europe and the Middle East. Want to run a Byzantine campaign? an  adventure centered on a mountain fortress in Lebanon? It's all here: everything  you need to know to live or die in world-spanning adventures from  1094-1192. 
Crusade of Kings is filled with information on key environments (How did people dress in Antioch? What's a really bad day to be caught in Jerusalem?) and with profiles of major players in the first three Crusades, including larger-than-life figures like Richard the Lion Hearted and Saladin. It has exactly the information you need to run a Crusades-based campaign without getting bogged down. There are also dozens of adventure seeds for GMs who want to get started in a hurry.
- Author writes a very popular history  column on the DailyKos website.
 - Includes material for history teachers  using it as a classroom supplement. (The author is a high school history teacher  who uses roleplaying to teach history and government) 
 - All the splendor, majesty, and senseless  destruction of the first three Crusades (1094-1192), designed for the Wildside  Gaming System (but easily adapted to other systems).