What you see in the picture is Cronus fighting his son Zeus. If you didn't know the warrior on the pegasus is Zeus by the way.
Once Zeus was born his father Cronus was knew he would defeat him once he was older so he was gonna eat him but his mother Rhea didn't not want that so she tricked Cronus into eating a rock. Rhea took Zeus and sent to mother earth. Zeus train to defeat Cronus for many years, mother earth became his mother in a way since he never met his real mother which was Rhea. Once Zeus defeated Cronus, he became king of the universe , he shared his powers with his brother and sisters. His brother Hades controls the underworld. His other brother Poseidon controls the oceans, earthquakes.