Lyaal
Lyaal was a Triannon male who served under Pri'Nam D'Jamat during their war.
In November 2153, he assisted D'Jamat in seizing control of the Earth Starfleet vessel Enterprise NX-01. He was captured by Captain Jonathan Archer in a corridor, who took detailed internal bioscans of him to enable Doctor Phlox to find a way to disable the Triannon organic explosives. (ENT: "Chosen Realm")
Lyaal was played by an unknown stunt performer.
His name was spelled "Lyall" on StarTrek.com.