Unlike their sometime rivals the Templars, the Order of St John of the Hospital of Jerusalem (or the Hospitallers as they are better known) was not created as a result of the First Crusade in 1099: rather, it was probably established by a group of Italian merchants from Amalfi in the mid-11th century. However, as a consequence of the crusading movement, the Hospitallers became recognised experts in the military capabilities of opposing Islamic armies. This book, the first of two to examine the lifestyle, experiences and military role of the Hospitaller knight, covers the period from the foundation of the order to the invasion of Rhodes in 1306.