|The Crusader Castle of Kantara, Cyprus|
|Interior of Hospitaller HQ at Acre|
|Vaulted Chambers at Kolossi|
As the Franks became wealthier or the threat became more intense the Franks started building outer works to provide a line of defense beyond (i.e. before) the castrum containing so many vital parts of the castle’s inner life. These outer works may have originally been intended to provide a modicum of protection to the towns that often grew up around castles, but they soon evolved into what became one of the most distinctive, indeed iconic, type of crusader castle: the concentric castle. These were generally the castles of the military orders, built with the huge resources available to them and were more purely devoted to military dominance rather than the castles of secular lords or royal castles. These were the castles that inspired Edward I’s castles in Wales. In addition to Krak de Cheveliers, a famous example of this type of castle was Belvoir, overlooking the Jordan valley. Belvoir held out against Saladin a year and a half after the Battle of Hattin; Krak de Cheveliers, however, he never even tried to assault, deeming it too strong.
Other crusader castles of this type were Montfort (or as the Teutonic Knights called it, Starkenburg), Beaufort/Belfort, Margat, and Saone.