Goth

Goth was a Time Lord, he travelled to the planet Terserus at the Master call. Goth then assassinated the Lord President of Gallifrey and lured the Doctor to Gallifrey.

Goth died battling the Doctor in The Matrix on the Master's order. (DW: The Deadly Assassin)

Goth had a brother named Rath. (NA: Blood Harvest)