Council of Gods
It is said that the Universe since it creation stood once at the brink of destruction: what was once brought to life by the Source of Life now threatened to destroy that life itself: Gods fought Gods and millions of lifeforms became victim of the raging conflict during the Chaos War.
To protect the Universe against the Gods and to protect the Gods against themselves, Cato - together with Lumina, Germania and Sakat - created a Council of Gods and subdued the other Gods. The four together were called the Tetrarchy, or Tetrarch Gods.
From all the deities that existed, Cato only accepted a handful of Gods to reign next to Him in the Council, to look out over the Universe. Those are minor deities and play no very important role, but assist the Tetrarchy in their tasks.