The Norman Conquest by Marc Morris
However, William also stopped the slave trade, and introduced a revolution in law, church reform and church architecture. His greatest contribution, however, was the Domesday Book, the great survey of the ownership of land in the Kingdom. He also regarded his wife with great respect, and she often acted as his Regent.
This book by Marc Morris was well-researched and the history was interesting. Morris discusses everything in great detail, and covers all of the historians' arguments. However, I could only read a little bit at a time, because there are so many characters involved in this history that it's rather tortuous, and the writing is dry at times. However, I'm off to read about the great Queen Matilda now!