Uhlan was Proconsul Neral's relatively minor title at one point while he served in the Romulan Guard. (TNG: "Unification II")
Background
In the real world, an uhlan is a skirmish fighter armed with a lance, and later, pistols. The term is of middle European origin. As a grade, uhlan is an enlisted rank in a fighting organization, below a sergeant or corporal. In comparison to naval ranking systems, this rank is marginally equivalent to the naval crewman ranks.