The Alastor Cluster is the fictional setting of three of American writer Jack Vance's novels: Trullion: Alastor 2262 (1973), Marune: Alastor 933 (1975), and Wyst: Alastor 1716 (1978), each named after a world in the cluster. Vance planned a fourth novel Pharism: Alastor 458, but it was never written. A globular star cluster Vance describes as "a whorl of thirty thousand live stars in an irregular volume twenty to thirty light-years in diameter," the Alastor Cluster is part of Vance's larger Gaean Reach fictional universe. Three thousand of the star systems in the cluster are inhabited by five trillion humans. Vance describes them as having "little in common except their lack of uniformity." They are ruled by the mostly hands-off, laissez-faire Connatic, Oman Ursht, "the sixteenth of the Idite dynasty".
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