Mazar is the homeworld of the Mazarites. The government is known as the Mazarite High Council. Mazar was one of the planets involved in the Interspecies Medical Exchange in the 2150s.
The Enterprise visited the planet in 2152 to bring the Vulcan ambassador V'Lar home. V'Lar had been attempting to expose corrupt Mazarite officials there. (ENT: "Fallen Hero")