Archon (The Nameless City)

The Archons were a race that existed at the beginning of time.

History
The Archons were the rulers of time until the ancient Gallifreyans declared war on them and wiped them out, save for seven survivors.

The Second Doctor encountered the Archons, and stopped them from stealing his TARDIS in order to launch a pre-emptive strike against the Time Lords. (PROSE: The Nameless City)