When I ran Dark Sun last year, templars were the closest thing to a "cleric/priest" analogue. The sorcerer-kings would do rituals that allowed templars to tap into the latent divine energy that still existed on the planet. They let the templars think that the sorcerer-king was the source of the powers, and templars who start to suspect the truth don't tend to live very long.
Templars were simultaneously courtiers, enforcers of the kings' mandates, but also healers and protectors, so they had a very complicated relationship with the populace.
Not canon, of course, but I find canon pretty meaningless compared to the fun of new takes.