Thopok was a Klingon who served in the Klingon Defence Force during the 24th century.
In 2373, Thopok was the commander of the guard for Lady Grilka. He was discharged from his position after he challenged and lost to Quark in a honor duel. (DS9: "Looking for par'Mach in All the Wrong Places")
External link[]
Thopok article at Memory Alpha, the canon Star Trek wiki.