From Lexicanum

Pavonis is a Tomb World, where it is believed the Nightbringer was held in stasis. This ancient C'tan and its Necron horde were unleashed by Dark Eldar and traitorous humans who were eager to attain immortality and power. Space Marines from the Ultramarines Chapter, 4th Company, failed to prevent the Nightbringer's escape.

More recently Pavonis was invaded by the Tau Empire who attempted to annex the planet. The Ultramarines 4th Company and the Pavonis PDF defeated the attempt. The Ultramarines were lead by the now reinstated captain Uriel Ventris.

Much of Pavonis was made up of trading guilds and cartels. These cartels would gain and lose power as the political tides turned, and smaller cartels developed around the bigger ones. All the political decisions of Pavonis was decided by the governor and the Senate. The Senate made up the cartels, and the governor was the leader of the cartel currently in power.

The Cartel Senate was disbanded by the Administratum due to the rebellion. The cartels lost most of there power and the high ranking officials that now govern the planet are not from Pavonis, The exception to this is the Governor who is from the Shonai cartel.

Notable cartels were:

• Shonai
• Vergen
• Taloun
• de Valtos
• Honan

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Sources

Nightbringer (Novel) by Graham McNeill Courage and Honour (Novel) by Graham McNeill