From PathfinderWiki

Although the history of daemonkind is constantly being edited to favour the current Horsemen, Ceolaeros the Twice Risen was the Horseman of Pestilence in distant history. It is believed that Ceolaeros made a deal with the entity known as Tegresin the Laughing Fiend in order to guarantee his position. Ceolaeros somehow failed his benefactor and went into exile after resigning from his position as Horseman, an unprecedented event for one of the Four Horsemen.1


  1. Amber Stewart. “Chapter 2: The Radiant Spark” in Ruins of the Radiant Siege, 25. Paizo Inc., 2020