Lizard King

The Lizard Kings were the Mondasian equivelant of Earth's Silurians. They lived on Mondas along side the Human-like Mondasians and the Mondasian Sea Devils, although it could be that they too were called Lizard Kings.

History
The Cybermen sent out a cybership to the Dark Continent to search for the lost Lizard Kings, finding statues of them only. (DWM: The Cybermen)