Crusader riparian rights

The latest issue of Water History has an article by Tobias Hrynick, "The mills of god grind slowly: the Na’aman River milling dispute and the thirteenth-century hydraulic crisis in the Crusader States", that looks into a dispute over water rights between neighboring water mills that seems a precursor to the riparian-rights disputes that were so numerous in the nineteenth century. The abstract:

In the mid-thirteenth century, the Hospitaller and Templar military orders engaged in a long-running dispute over the supply of water to two hydraulic gristmills outside the city of Acre in the Crusader Kingdom of Jerusalem that prompted international scandal, royal and papal intervention, and mutual attempts at sabotage. This article examines this dispute in the context of a broad survey of milling operations in the Crusader States and argues that this dispute was representative of a widespread hydraulic shortfall in the Latin East by the thirteenth century, when the kingdom’s military collapse and the increased cultivation of sugar cane aggravated a pre-existing shortage of water-power in the relatively labor-poor eastern Mediterranean. The efforts of local landholders like the military orders to maintain access to hydraulic resources provide an instructive example of a pre-modern society’s efforts to accommodate an environmental crisis.

The Templar mill on the Na'aman today (photo: Liorca)