Grayvas was a Cardinal of the High Council during the Last Great Time War.
He suggested that the Time Lords send a flotilla of Battle TARDISes into the Tantalus Eye to deal with the Dalek threat. The War Doctor reminded him that the Time Lords had already tried this and it had failed. (PROSE: Engines of War)
Grayvas attended a meeting arranged by Rassilon on the final day of the war. He was later present in the War Room when Rassilon met with the High Council for the Ultimate Sanction. (TV: The End of Time)
Behind the scenes Edit
Grayvas is identifiable on the High Council in The End of Time as Engines of War shows him as the only member on the Council with a beard.