This work would not have been completed without the tireless work and dedication of the Seshat research team. We would like to single out especially Enrico Cioni, Jill Levine, Jenny Reddish, Edward Turner, Sal Wiltshire and Gregory Youmans, who compiled and checked much of the data found in this volume. We gratefully acknowledge the invaluable assistance we receive from our collaborators, who ensure that Seshat holds the most comprehensive, up-to-date information possible. In particular, we thank the following for reviewing portions of this volume (though any remaining mistakes are entirely our own): Mark Altaweel, Abel Alves, John Baines, Jim Bennett, David Carballo, Metin Cosgel, Alan Covey, Gary Feinman, Patrick Kirch, Andrey Korotayev, Nikolay Kradin, John Miksic, Ruth Mostern, Alessio Palmisano, Peter Peregrine, Johannes Preiser-Kapeller and Katrinka Reinhart. Please see the Seshat website (seshatdatabank.info) for a full list of private donors, partners, experts and consultants, along with their respective areas of expertise.