Devon Manning was the eldest of three children born to Robert and Alana Manning (née Carlisle). He was born five years before the first orcish invasion of Azeroth, in Stratholme, Lordaeron. His mother died giving birth to his younger brother Terimas when Devon was seven years old.
Devon and his two younger brothers — Hansen and Terimas Manning, grew up in near-poverty as their father became a severe alcoholic, causing his business to plummet. As time passed, Robert became increasingly abusive to Devon and his brothers. Devon would often comfort Terimas by telling stories about the holy light, which Hansen would often dismiss it as mere fiction. After several domestic incidents, Devon ran away as he felt he couldn't bare to be around his father any longer.