If you are unfamiliar with your subject area, it will be very helpful to begin with a source that summarizes the main events or circumstances and also describes the historical context. This strategy also helps you verify that at least some research has already been done on your topic
Examples of sources that provide broad overviews:
Credits: This info box was adapted from Mary Stuart for the University Library of the University of Illinois Urbana-Champaign ©2008 Mary Stuart. For more, see this History LibGuide