What is Diplomatic History? Eight historians ask what constitutes diplomatic history. John Earle | Published in History Today Volume 35 Issue 7 July 1985 D. C. Watt (Professor of International History, University of London) To continue reading this article you will need to purchase access to the online archive. Buy Online Access Buy Print & Archive Subscription If you have already purchased access, or are a print & archive subscriber, please ensure you are logged in. Please email digital@historytoday.com if you have any problems.