The Coalition of Madena is comprised of two M-class planets, Altec and Straleb in the Omega Sagitta system. Both worlds are populated by humanoid races.
The two worlds were technically at peace, but relations were severly strained until 2365, when Benzan of the Straleb and Yanar of Altec, both children of the respective leaders of each world, became engaged. (TNG: "The Outrageous Okona").