Zorac's scarlet robes indicate that he was probably a Prydonian.
In DWM 100, which gives a brief history of Gallifrey and the Time Lords, it is reported that Cardinal Zorac and ChancellorThalia were the two High Council members sent to investigate events in the Death Zone by Borusa, where they both perished. A corpse wearing scarlet robes is found in the Death Zone by The Master, who recognises it as "one of my predecessors" (as Council investigator). (TV: The Five Doctors)
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