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)

Borusa became Acting President of Gallifrey, during which he still made time to tutor the more interesting Time Lords and researching ways to stay alive, knowing the Doctor might turn up again sooner or later. One of his students during this time was Romanadvoratrelundar. He saw much potential in her, but did not expect her to go too far, and was consequently surprised when she left Gallifrey for a short mission and even more surprise when she didn't come back. (PROSE: Doctor Who and the Krikkitmen)

Return
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)