The Golden Horde

The Golde Horde was a brutal military regime established by dissidents of the Corvian army under Field Marshal Anton Nagy I, who due to heavy spring rains and local hostility failed to withdraw to Corveaux through the Westerlands after the Corvian Invasion of 1240. 
Anton Nagy and his soldiers settled in the city of Cassow in 1242 where a council proclaimed him Emperor. Their domain grew rapidly under his rule as they sent out invading armies in every direction. Although they dominated and terrorized the constantly shifting territories in the Westerlands and meddled in internal Vichinian and Carinthian disputes for near two centuries, they also allowed for an unprecedented exchange of trade, technologies, commodities, and ideologies between Corveaux and Vichin.
The Golden Horde was finally annihilated during the Golden War of 1420. Anton Nagy III was slain in battle and the scattering horde were routed by the forces of King Florence II.