From the back of the book:
People and places, history past and present, armies and navies - you'll find it all in this Book of Facts. This is the first in the yearly series of almanacs providing the most comprehensive information ever published on the D&D Game worlds.
Also included is a massive collection of world events happening in the year of AC1010. Battles, skirmishes, and a host of historic events take place in the wake of the Great War of Wrath of the Immortals, enough to fill an entire game year!
Make your game world life-like as you watch the glorious return of Thyatis, and discover the amazing fate of Alphatia!