Ijurn

Ijurn is a planet. Presumably, Rann's from it.

Megatron, Starscream, Shockwave...always focused on pettiness, never looking at the bigger picture. Even Rann of Ijurn had more vision, more knowledge of the universe around him...until we crushed him and conquered his world, of course.Skystalker, "Recipe for Hate"

Fiction

Dreamwave Generation One continuity

Ijurn was the domain of someone named Rann, one of the numerous "foes and would-be conquerors" encountered by Skystalker and Skyhopper during their long sojourn in space. The two Decepticons destroyed him and took over Ijurn. Recipe for Hate

The AllSpark Almanac

Ijurn was an organic world in the Decepticon Empire. Megatron appointed Magnificus military consul to Ijurn, a post the Decepticon diplomat excelled at. The AllSpark Almanac II