The leader of a band of Triannon zealots who seize Enterprise to use it in their holy war.
D'Jamat is the Pri'nam, or leader, of a group of Triannon religious zealots who revere the spheres of the Delphic Expanse. In Chosen Realm his followers come aboard Enterprise as pilgrims and then seize the ship, intending to use it against a rival sect that disagrees with them over a point of doctrine.
D'Jamat also means to punish Archer for supposedly desecrating a sphere, and his followers include suicide bombers. Archer tricks him into believing that he has died and retakes the ship.