Before HogZog the Greatest, there was total chaos between the hog tribes.

-The Arleens roamed Mars's Formerly Lush Plains feeding upon the Other Martian Species who in turn feed about the lush grass growing from the Martian Canals.

-The Urka would raid the Arleens for food and inhabited the colder areas of Mars. They were known to burrow into ice spikes and build underground cities.

-The Ruparans would trade valuable silicon metals gotten from Rare Martian Caves to the Arleens in exchange for food. The Ruparans also offered the Arleens protection from the Urka.

-The Arleens were slowly enslaved by various Lesser Demonic Kings who emerged from Other Martian Species that made contracts with Muzan in exchange for more power.

-To conquer the Arleens the Lesser Demons tried killing all Martian Species not under their control to thus lead to less weak food for the Arleens to eat. 

-The Arleen lacking easy food were forced to obey the Demon Kings.

-Lacking trading partners the Ruparans were forced to become slaves for the Lesser Demons in exchange for food.

-They would work the mines providing silicon for the Lesser Demon Kings.

-The Urka however would still have their icey water which they could melt to drink. To get food the Urka would raid the Lesser Demon Kings.

-Many Urka would be captured and enslaved during these raids.

-Hogzog the Greatest was born as mere Hog the Slave.

-Hog the Slave was from the Urka tribe and was captured after leading a raid against the Lesser Demonic Kings.

-Hog the Slave would however secretly break his bonds in one day using his incredible strength. Every day when the Lesser Demons were forced to hide from the sun, Hog the Slave would plot.

-Hog convinced his Urka Raiders to work with the Arleen and Ruparans so that they could free themselves from slavery.

-Hog's Slave Rebellion stole silicon and made armor to fight the Lesser Demons with.

-Hog's Slave Rebellion butchered their Lesser Demon Slavemasters and overthrew their Lesser Demon King.

-Hog was the first to ever kill a Demon King. He was therefore proclaimed Hog the Greatest. 

-Hog would consume tons of Muzan Blood thus slowly but surely becoming more powerful, mutating his form, while also becoming a blood addict.

-The Hog Empire conducted secret operations to free slaves from the Lesser Demon control.

-The Lesser Demon Kings were too busy bickering to fight back against the Slave Rebellion.

-Hog declared that the Arleens, Ruparans, and Urka were all united by their hatred of the Demons and therefore were a greater tribe known as the Hogs.

-Many of the various tribes had died during the wars against the Demon Kings. Hog decided to conduct dark magic using his new demonic powers to bring them back to live.

-These newly revived tribes had no memory of their former lives and would be renamed as the Zogs.

-Hog the Greatest declared that the Hogs and Zogs should be united under the Hogzog Empire.

-The Hogzog Empire used silicon to make space ships so as to invade other planets for food and resources. They were unable to send a large powerful expedition since they had to keep watch incase the Lesser Demon Kings attacked.

-The Hogzog Empire sent their small expedition to Earth thus founding the Hogzog Imperial Outpost.

-During the Slave Rebellions Hogzog the Greatest had a son known as Hogzog the Great. Hogzog the Great unlike his father dreamed of rocketry as opposed to merely fighting for what scraps of food the Hogzogs could get.

-Hogzog the Great ordered the construction of rockets and lead a expedition to Earth in order to found the Hogzog Imperial Outpost.

-Since Hogzog the Greatest feared his son overthrowing him, he did not protest his son's departure.