André Geraque Kiffer 
Crusades In The Levant, 1096 To 1291 [PDF ebook] 

Since the Persian Empire reinstated a Jewish state in Palestine — after its Diaspora by the Assyrians and Babylonians — through the Empire of Alexander and successors to the Roman Empire, there has always been a political-religious space for the descendants of Jacob (Israel). In the simulation it will be sought to establish and maintain a Crusader state territory (kingdom) in the Levant, more or less in accordance with the integration of biblical Israeli tribes maps from 1200 BC, the UN partition of Palestine in 1947 AD and the physical geographical area — like a stronghold based on safe boundaries.