Prospero

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Prospero as it was in its glory days.

And after the Wolves arrived. Sucks to be them, huh?

Prospero was the world Magnus the Red landed on, and thus home to the Thousand Sons. Conveniently enough for the red cyclops, Prospero had become a haven for psykers like himself and had flourished into a full-fledged paradise world, covered in white marble spires and powered by techno-psychic energy arrays. After curtailing the activity of a race of dangerous psychic predators called the Psychneuein, Magnus was named the leader of the planet, at which point it had become a veritable library of lore about the Warp that supposedly could not be found anywhere else (about that...).

Unfortunately, he never realized how vulnerable the planet was to an attack from above. It was one of the most heavily defended planets of Imperium by the time--not because of some huge heavily fortified fortresses, but because Thousand Sons could predict when and where their enemy would arrive, and wipe them from existence even before they could enter realspace, and even if they somehow managed to bypass the perils of the Warp and the Thousand Sons' fleet, the capital (and actually only) city of Tizka were protected by the thickest telekine shields in the galaxy, capable of withstanding Exterminatus-level bombardment, and any planetfalling invaders were to face the fury of a legion-sized force of incredibly powerful sorcerers. Magnus was so sorry that he broke the Golden Throne that he tried to get rid of all of that.

It was destroyed by the Space Wolves early in the Horus Heresy in what is now called the Burning of Prospero, mostly because Magnus himself sabotaged almost all of the planet's defenses, since he thought he deserved his punishment, and the sorcerers who defended the city were incapacitated by the Sisters of Silence and the returning of the Flesh Change. Following that event, the surviving Thousand Sons relocated to the Planet of the Sorcerers (also known as Sortiarius).

Shortly afterwards, the Khan visited Prospero to find out what happened there, and ended up having a duel with Mortarion.

In the 41st Millennium, Prospero is a blasted ruin, occasionally visited by Rogue Traders seeking artifacts and Ahriman moping over his failures. However, it got off better than Barbarus, Chemos, Colchis, Nostramo, and Cthonia, which were all completely destroyed.

Appropriately, it was named after Prospero, the sorcerer and protagonist of Shakespeare's play, The Tempest.