Altair Sigillite heir to Malcador the Sigillite, The First Lord of Terra, who served as essentially the Emperor's Regent when he was away from Terra during the Great Crusade and the Horus Heresy eras. The title of "Sigillite", meaning "seal-bearer" in an ancient Terran language, was a measure of the esteem and trust the Emperor had for Malcador, for he was empowered to speak and act in the Emperor's stead with the Emperor's full authority wherever he went. Credited with founding both the Adeptus Administratum of Terra and the Officio Assassinorum, as well as laying the foundations of the organisations that would become the Imperial Inquisition and the Grey Knights. He also secretly served as the first Grand Master of Assassins of the Officio Assassinorum.
Altair Hearing the Voice of the True Emperor of Mankind Set out to Renew The Inquisitors, to Purify This Galaxy in his Holy Name…

~Whispers say he plans a Great Crusade to reopen the gate to Terra~

"The Emperor Protects..."