Marka Ragnos is a restored House of Clan Naga Sadow in the Brotherhood of Dark Jedi. Originally founded in 9 ABY and formed out of the Disciples of Ragnos, Marka Ragnos is the only surviving House out of the original three of Clan Naga Sadow. Marka Ragnos is resilient, as shown by both its leadership and its members.

As the elder House of Naga Sadow, Marka Ragnos is steeped in tradition and history. Many Dark Councilors have passed through it's halls, and the House maintains a vast library of rare tomes and dark secrets at the Ragnos Cathedral in Kar Alabrek.

In recent years, the House has expanded both economically and militarily to bring it into the modern age, establishing a new economic center at New Eden, as well as revitalizing the old military base of Mucenic. The House's territory of Tarthos and Inos are often the first place outsiders visit when entering the Orian System, so the House is wary for troublesome outsiders and also maintains patrols to watch for pirates and smugglers.