Margrave’s Bastard Son was The Emperor

Betrayed by his nephew and imprisoned after a brilliant reign, Emperor Ian of the Bariel Empire faces a tragic end until a loyal wizard unleashes forbidden space-time magic. Thrust one hundred years into the past, Ian awakens in a new body: that of his own family's forgotten illegitimate son, an outcast of the extinct Margrave lineage who is moments away from being handed over to ruthless barbarians as a hostage. Armed with the profound knowledge of a fallen emperor and a second chance at life, Ian must navigate a treacherous web of bloody conspiracies, reclaim his destiny, and rewrite history from the shadows.