Koloy Mardis was a Kefan ruler, who was the Murdoh of the city of Ari and later the king of the kingdom of Ari. He is notable for having started a two and a half century civil war when he demanded independence from Rufu Aoa, the king of Afanyu. His request was denied, and Mardis attempted to take power by force. After a number of inconclusive battles with Aoa, Mardis proclaimed himself to be the king of the short lived kingdom of Ari. He was killed by his own sons who betrayed him to a contestant outside of the family.

Not much is known about Mardis' early years. He seemed to have received a military education and his position as Murdoh was combined with Jeen of the city army. Military support allowed him to make the claim to power and then support it by actually marching on Rufu Aoa.