High Council of Time Lords, sometimes called the Supreme Council, is the governing body of the Time Lords on Gallifrey.
Officially, without a President, the Council could ratify nothing, even if this occurred in exceptional cases such as the absence of the President-elect.
At the end of the trial against the Sixth Doctor and the revelation of the Time Lord's involvement in the Ravolox affair, insurrections burst on Gallifrey and the High Council was deposed; new elections were announced.
By time of the Last Great Time War, the Time Lords had resurrected Rassilon, who returned to lead the High Council against the Daleks. At least an emergency session of the council was arranged, when the War Doctor and his companion Cinder landed on Gallifrey, bringing news about the Temporal Cannon of the Daleks. It was the first time a human had been allowed to attend such a meeting. (PROSE: Engines of War) By the last day of the war, the High Council met in a darkened chamber in the ruined Citadel. They met there on the last day of the war to discuss Rassilon's Final Sanction.