The House of Stillhaven was one of the Great Houses of Gallifrey. Amongst its members was Rallon. Stillhaven's Kitriarch was present when the Doctor was held accountable for the disappearance of Rallon. (PROSE: Divided Loyalties)
On the final day of the Last Great Time War, the Patriarch of Stillhaven opposed Rassilon's Ultimate Sanction. He was shamed alongside the Woman when Rassilon tried to escape the Time War. The remaining members of the House had their memories wiped and were experimented on. (PROSE: Lords and Masters)