According to USA Today:
Created by Heroes writer Michael Green, Kings takes the biblical story of David and King Saul and puts it through a Shakespearean/sci-fi/soap-opera wringer. Much is lost in the multiple washes, but something is gained as well, most notably the sense that you're watching something that isn't like everything else you're watching.
There is some humor (most provided by a Rosencrantz and Guildenstern type pair of guards) and much Dynasty-style wrangling for power. Among the wranglers are a devious prince with a secret (Sebastian Stan), a beautiful princess with a secret vow (Allison Miller), a duplicitous brother-in-law (Dylan Baker), and two more biblically influenced characters: the prophet Samuels (Eamonn Walker) and General Abner (Wes Studi).
For more on the subject, see TV Shows Featuring Indians.