Madrigor
From Tardis Wiki, the free Doctor Who reference
Madrigor was a rogue Time Lord. He was the youngest on Gallifrey to ever be appointed a Time Lord. Madrigor was greedy, however, and used his powers for his own ends, and not for the greater good. Eventually the Time Lords found out that he had been traveling through time and space to other planets and stealing from them. He was tried for his crimes, but never punished, able to escape before his sentence was carried out.
Madrigor made a home on Lunargov III, and lived a nomadic existence. The Third Doctor and Sarah Jane Smith were sent by the Time Lords to find him and bring him to justice. (PROSE: The Time Thief)
