Haakonian

From Memory Alpha, the free Star Trek reference.

You may be looking for the Harkonians.

The Haakonians are a warp-capable, humanoid species found in the Delta Quadrant. Their government is called the Haakonian Order.

Physically, Haakonians are tall and pale skinned and, like most races, are susceptible to metreon poisoning.

Sometime before 2346, the Haakonians conquered Talax following a decade-long war which concluded with the Haakonians' deployment of the metreon cascade on the Talaxian moon, Rinax. This weapon caused such devastation that it instantly ended the war, with the Talaxians yielding their homeworld and colonies to the Haakonians.

The only known Federation encounter with the Haakonians was made by the USS Voyager in 2371, when the Haakonian scientist Ma'Bor Jetrel came aboard Voyager seeking Neelix. Jetrel had been involved in the war with the Talaxians, having developed the metreon cascade which killed thousands of Talaxians. Although ostensibly seeking to cure a side-effect of the cascade, Jetrel was actually trying to reverse its original effects. Sadly his experiment failed and Jetrel died of metreon poisoning soon afterwards. (VOY: "Jetrel")

The Haakonians and the Haakonian Order are nods to the House Harkonnen from the successful science fiction novel series Dune, created by Frank Herbert. Both organizations are noted for being cruel and imperialistic with little regard for those they subjugate, with the Haakonians on Voyager based closely on the behavior of the Harkonnen soldiers of the Dune series.