Borusa (The Invasion of Time)

Borusa was a Time Lord who held the office of Lord Chancellor.

Biography
The Fourth Doctor returned to Gallifrey briefly to claim the post of Lord President, but was secretly working to defeat the telepathic Vardans in their quest to invade Gallifrey, a ploy which he eventually confided to Borusa. The Doctor asked his old mentor to remain in a lead-lined room to prevent the Vardans from reading his mind. Borusa acknowledged that he was too one-track-minded to employ the Doctor's "trick'" of keeping his thoughts too chaotic for the Vardans to read. Once the Vardans and their puppet masters, the Sontarans, had been defeated, the Doctor departed, again leaving Gallifrey in Borusa's hands. (TV: The Invasion of Time)

Later, after another incarnation had been imprisoned in Rassilon's Dark Tower (TV: The Five Doctors) when his fierce pride tipped over the edge of ambition into madness, the Eighth Doctor convinced Rassilon to release Borusa, regressed to his earlier incarnation, to lead Gallifrey after the Niroc affair. He bore the robes of a High Cardinal. (PROSE: The Eight Doctors)

Appearance
This incarnation of Borusa was a tall man with white hair and hawk-like eyes (PROSE: Doctor Who and the Invasion of Time) that blazed with fierce intelligence, wearing a hawk face that was seamed and wrinkled. (PROSE: The Eight Doctors)