Some time after the First Blight, the Grey Warden Sashamiri imprisoned Corypheus in a tower stemming from the Deep Roads in the middle of the Vimmark Mountains. Although the Chantry claims that their breach of the Golden City is what turned it into the Black City and unleashed the Blight, Corypheus would later claim it was already blackened and empty when the magisters entered it.
When they did so, they were cast out and tainted, becoming darkspawn. Along with six other Old God priests, Corypheus was influenced by the Old Gods to try and break into the Golden City. Corypheus is a former Tevinter magister and priest of the Old God Dumat, alive during the height of the Tevinter Imperium.
