Merlin reveals Arthur 's true identity as the son of the last king , Uther Pendragon .
Some , led by Maleagant , refuse to accept the rule of an illegitimate royal child and declare war .
Merlin reveals Arthur 's true identity as the son of the last king , Uther Pendragon , but some , led by Maleagant , refuse to accept the rule of an illegitimate royal child and declare war .