Tyrann

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Tyrann is a planet in The Stars, Like Dust by Isaac Asimov.

Asimov has a character recall a source (described as being based on unreliable information), that claims that Tyrann was the 1099th planet settled by colonists from Earth (the first being the Spacers). It was about 500 light years (150 parsecs or 5 exameters) from Earth. Due to global 'water dearth', the planet was mostly desert.

The ruler of Tyrann was called the 'Khan'. Tyrann was able to conquer the fifty Kingdoms near the Horsehead Nebula in a decade. Following this victory, Tyrann suppressed science and space navigation training in the Kingdoms, to help maintain control over its subject worlds.

Spoiler warning: Plot and/or ending details follow.

Eventually, a rebellion led and sponsored by Rhodia is successful in overthrowing the Tyranni hegemony.

Major and minor planets featured in Isaac Asimov's Foundation series

Anacreon | Aurora | Baley's World (Comporellon) | Earth | Gaia | Helicon | Kalgan | Korell | Delicass (Neotrantor) | Sayshell | Solaria | Siwenna | Tazenda | Terminus | Trantor (Hame)