Senior Time Lord
From Tardis Wiki, the free Doctor Who reference
The President and Chancellor were recognised as Senior Time Lords, whom commanded younger Junior Time Lords and were distinguished by their "flowing, ornamental robes". (PROSE: The Three Doctors)
By another account, the titles of First Time Lord, Second Time Lord and Third Time Lord referred to "the three most superior Time Lords". (PROSE: Doctor Who and the Doomsday Weapon)
