Markon held the rank of general within the Imperial Army of the Galactic Empire, specifically serving in the 201st Squadron. From 19 BBY to 14 BBY, the planet Zeffo, which is located in the Outer Rim Territories, was visited by the 201st Squadron. Acting on Imperial Code 94364's instructions, Markon issued an eviction notice in a village situated on Zeffo. This was done to displace the local population, thereby advancing Project Auger, an Imperial initiative focused on unearthing ancient relics on Zeffo. Villagers who followed the order were transported to labor camps, but those who resisted were killed.
The 2019 video game Star Wars Jedi: Fallen Order, which was created by Respawn Entertainment, included a reference to Markon.