Conquest was first seen in a prophetic dream had by Ichabod Crane riding along side the other three horsemen.
Conquest's first physical appearance was when he was chasing Thomas Grey into Sleepy Hollow in order to spread a plague through modern-day Sleepy Hollow that he had placed on the people of the Colony of Roanoke centuries ago. After Abbie Mills and Ichabod Crane discovered the survivors of Roanoke and the plague, they learned of the Horseman (known as Pestilence and identified as Conquest by Ichabod) and his goal to enter their realm through his plague in order to join up with Death. Later, the Horseman tried to stop the two from healing Thomas of his plague as it would make him unable to manifest a physical form in the real world. Despite his efforts, Ichabod and Thomas were healed of the plague, causing Conquest to dematerialize into dust as he was making a charge towards Abbie.
Conquest did not appeared in season 2 as rumored, yet many fans suspected that Frank Irving, Luke Morales, Sheriff Leena Reyes, Nick Hawley, Katrina Crane or Benjamin Franklin could be the next Horseman.
- In the actual Book of Revelations, Conquest is the First Horseman of the Apocalypse, who wields a bow and rides a white horse. In the series the Headless Horseman known as Death, is the first horseman who rides a white horse while Conquest rides a black horse (the horse more commonly associated with Famine).
- In the early 1900s depictions of the Four Horseman of the Apocalypse in pop culture began referring to the Horseman of Conquest as Pestilence in order to distinguish a difference from the second horseman, War.
- Since both Death and War were once mortal men who sold their souls to Moloch, it is possible that Conquest was also a mortal man who sold his soul.
- So far, it seems like Conquest/Pestilence's only ability displayed is his ability to spread sickness. But if the sickness is contained, the Horseman can't do anything.