The Kalligs of Ziost were easily the most ambitious and most dangerous of the noble Sith families. Their love towards Sith aliens also aided them in their eventual downfall five thousands years ago. Three thousand years ago, they were revived by the reviled Darth Nox.
—Ki-Adi-Mundi
The House of Kallig, also known as the Great House of Ziost, the Dark Masters of Dromund Kaas or simply House Kallig was a prominent Sith Noble House founded by the dreaded Dark Lord of the Sith Menelag Kallig, later in life known as Darth Nox. Throughout history, the Kallig family were known for producing the deadliest of Sith Lords and being fervent supporters of the Sith Empires. Naturally pro-aliens, the House of Kallig was gradually destroyed following the death of its first recorded member, Aloysius Kallig. Since then, descendants of the House were raised as slaves for the Empire until one member, Menelag, was discovered to be Force-sensitive. Menelag grew to become a powerful Sith Lord and after discovering his lost legacy, he spend years rebuilding the once proud Sith House. After his ascension as a Dark Councillor, the name "Kallig" was given a newfound fear and respect that the House hasn't seen for centuries.
In the years following Lord Sithis' fall from power, the Kallig family abandoned the Sith Order and joined forces with the Jedi henceforth, becoming one of the few Sith Purebloods to have been Jedi. Even at around 139 ABY, most Kalligs are still haunted with the past of the House of Kallig and their infamous patriarch, Sithis.