Marune: Alastor 933 (1975) is a science fiction novel by Jack Vance, the second of three books set in the Alastor Cluster, ruled with a loose hand by the mysterious Connatic. It is one of three books set in the Alastor Cluster, ‘a whorl of thirty thousand stars in an irregular volume twenty to thirty light-years in diameter’. Three thousand of the star systems are inhabited by five trillion humans, ruled by the mostly hands-off, laissez-faire Connatic, who occasionally, in the manner of Harun al-Rashid of The Thousand and One Nights, goes among his people in disguise.