Antares

Antares is a Medieval World, formerly Hive World, located somewhere in the Ultima Segmentum. It is home to the Ancestor's Summit, Fortress-Monastery of the Crimson Skulls Chapter of the Adeptus Astartes.

Has a single moon, known as "The Orphan".

History
Antares' past is shrouded in mystery; no records exist of it's discovery or colonization or when the Crimson Skulls originally settled there. All that is known is that the planet was a Hive World upon first entering the records some time in M35, with the initial settlement by the Crimson Skulls still being unknown.

The planet itself was cut off from the rest of the Galaxy by a series of Warp Storms that lasted for millenia, with only the 10th Company and a single Captain being off-world at the time. When the Warp Storms eventually dissipated, the Astartes left on the planet had mysteriously disappeared, and the vast Hive Cities had been entirely abandoned, with the populace living in Medieval societies away from their crumbling ruins.

Government
Nothing is known about Antares' ruling government as a Hive World, nor the Crimson Skulls' influences on it.

While the world was isolated by the Warp Storms, an unknown event caused the evacuation and destruction of the world's Hive Cities and the collapse of said government, with a number of different nations ruled by Noble Houses taking their place. Upon the Crimson Skulls' return, the heads of each Noble Family formed a council that would answer to the Chapter Master, accepting him as the world's ruler.

Noble Houses
The following are known Noble Houses that form the Council, and ruled the various nations of Antares before the Crimson Skull's return;
 * House Pleiades - Rulers of the nation containing Ancestor's Summit, and the first to come into contact with the Weeping Skulls. Most settlements were carved from stone into the feet of the mountains, the capital city was built over a Hive City.
 * House Virgo - Rulers of the largest nation, but also the least defended. Virgo's people relied on trade with neighboring nations to ensure their safety.
 * House Sagittarius - Rulers of a nation containing a large concentration of ruined Hive Cities, thus becoming the most advanced due to reverse-engineering salvaged technology.
 * House Pisces - Rulers of a pair of nations, one being a smaller nation of warriors, and the larger nation consisting of scholars and priests.
 * House Orion - Rulers of a vast plain on the planet's mainland, Orion's people were nomadic hunter-gatherers, with the capital city being the only permanent settlement in the region.
 * House Auriga - Unknown.
 * House Caelum - Unknown.