Ebook: The New Cambridge Medieval History, Vol. 5: c. 1198-c. 1300

This volume, one of seven in the series (though volume four has two parts), contains an abundance of information despite its limited (in terms of chronology) scope. All aspects of the Middle Ages, ranging from political, social, and military, are covered. Excellent source of information and a good place to start when doing any research during this time period.