The Forged Prince (The Chronicles of Tethera Book 1) by Michael Laird

http://www.amazon.com/Forged-Prince-Chronicles-Tethera-Book-ebook/dp/B012LWECCQ

Free 3/10/2016 - 3/14/2016!

Six hundred years past, High Queen Boudicca united the three great peoples of the south and fought the Roman Empire to a standstill.  Now a dreadful blight creeps forth upon the world, its only intent to crush all and end everything.  Even so, evil may oppose evil and a rival plays her own game.  The Queen of Deceit is forging a special weapon, intended to sunder prophecy itself.  Yet any weapon can turn in its maker's grasp and strike in an unexpected direction—most especially a weapon with a mind of its own.

Trained specifically to usurp a crown to seize a land where very little is ever precisely as it seems, Llew, who may or may not be a changeling, might just have his own ideas.