Greece and Rome
The Greek gods started off with Gaia and Uranus who then had 6 kids Atlas, Oceanus, Rhea Kronos, Epimethius, and Promethius. Rhea and Kronos then had another 6 kids and the line continued. But as Zeus and his siblings got older they had a war with their father Kronos eventually Zeus and his siblings won and were now leaders of the gods.
Rome had many Emperors through out their existence some major ones who had great impact were Ceasar Augustus, Nero and Trajan. Some of their impacts were good while others were bad for example Ceasar had good impacts and respected the senate were as Nero had negative impacts and did not help the citizens in any way even after a mass destruction.