books.google.com - In the last twenty years there has been an explosion of scholarly interest in the Military Orders. With a history stretching from the early twelfth century to the present day, they were among the richest and most powerful orders of the church in medieval Europe. They founded their own states in Prussia...https://books.google.com/books/about/The_Military_Orders_History_and_heritage.html?id=dSM_w4Q1sUwC&utm_source=gb-gplus-shareThe Military Orders: History and heritage
