The Urwyzden Confederacy was the joint government of the three planets in the Urwyzden system that was ruled by the Board of Premiers.
In 2377, the three planets of the Confederacy were plunged into civil war when each world bought weapons from Brunt and Gaila and were then manipulated into using them by Gaila's Breen guards. (ST novella: Reservoir Ferengi)