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The Urwyzden system was a star system, located somewhere in the space of the galaxy's Alpha or Beta Quadrants.
History and specifics
This system's orbit was the location of three of planets and was the home of the Urwyzden civilization.
By the year 2377, this system had become a major galactic banking center when Gaila and Brunt were able to sell weapons to all three worlds in the system causing a war between the planets. (ST - Seven Deadly Sins novella: Reservoir Ferengi)