Court of Principals
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The Court of Principals were an organization on Gallifrey which governed the Academia.
They were subject to the authority of the Pythia. Lord Dowtroyal a kinsman of Rassilon was one of the leaders of this group. After Rassilon's takeover and the fall of Pythia they probably formed the basis of the first High Council. (NA: Cat's Cradle: Time's Crucible)